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RDKit::DGeomHelpers Namespace Reference

## Classes

struct | EmbedParameters
| Parameter object for controlling embedding. More...

## Enumerations

enum | EmbedFailureCauses { INITIAL_COORDS = 0 , FIRST_MINIMIZATION = 1 , CHECK_TETRAHEDRAL_CENTERS = 2 , CHECK_CHIRAL_CENTERS = 3 , MINIMIZE_FOURTH_DIMENSION = 4 , ETK_MINIMIZATION = 5 , FINAL_CHIRAL_BOUNDS = 6 , FINAL_CENTER_IN_VOLUME = 7 , LINEAR_DOUBLE_BOND = 8 , BAD_DOUBLE_BOND_STEREO = 9 , CHECK_CHIRAL_CENTERS2 = 10 , EXCEEDED_TIMEOUT = 11 , END_OF_ENUM = 12 }

## Functions

RDKIT_DISTGEOMHELPERS_EXPORT void | initBoundsMat (DistGeom::BoundsMatrix *mmat, double defaultMin=0.0, double defaultMax=1000.0)
| Set default upper and lower distance bounds in a distance matrix.
RDKIT_DISTGEOMHELPERS_EXPORT void | initBoundsMat (DistGeom::BoundsMatPtr mmat, double defaultMin=0.0, double defaultMax=1000.0)
RDKIT_DISTGEOMHELPERS_EXPORT void | setTopolBounds (const ROMol &mol, DistGeom::BoundsMatPtr mmat, bool set15bounds=true, bool scaleVDW=false, bool useMacrocycle14config=false, bool forceTransAmides=true)
RDKIT_DISTGEOMHELPERS_EXPORT void | setTopolBounds (const ROMol &mol, DistGeom::BoundsMatPtr mmat, std::vector< std::pair< int, int > > &bonds, std::vector< std::vector< int > > &angles, bool set15bounds=true, bool scaleVDW=false, bool useMacrocycle14config=false, bool forceTransAmides=true)
RDKIT_DISTGEOMHELPERS_EXPORT void | collectBondsAndAngles (const ROMol &mol, std::vector< std::pair< int, int > > &bonds, std::vector< std::vector< int > > &angles)
| generate the vectors of bonds and angles used by (ET)KDG
RDKIT_DISTGEOMHELPERS_EXPORT void | updateEmbedParametersFromJSON (EmbedParameters &params, const std::string &json)
| update parameters from a JSON string
RDKIT_DISTGEOMHELPERS_EXPORT void | EmbedMultipleConfs (ROMol &mol, INT_VECT &res, unsigned int numConfs, EmbedParameters &params)
| Embed multiple conformations for a molecule.
INT_VECT | EmbedMultipleConfs (ROMol &mol, unsigned int numConfs, EmbedParameters &params)
int | EmbedMolecule (ROMol &mol, EmbedParameters &params)

int

EmbedMolecule (ROMol &mol, unsigned int maxIterations=0, int seed=-1, bool clearConfs=true, bool useRandomCoords=false, double boxSizeMult=2.0, bool randNegEig=true, unsigned int numZeroFail=1, const std::map< int, RDGeom::Point3D > *coordMap=nullptr, double optimizerForceTol=1e-3, bool ignoreSmoothingFailures=false, bool enforceChirality=true, bool useExpTorsionAnglePrefs=false, bool useBasicKnowledge=false, bool verbose=false, double basinThresh=5.0, bool onlyHeavyAtomsForRMS=false, unsigned int ETversion=2, bool useSmallRingTorsions=false, bool useMacrocycleTorsions=true, bool useMacrocycle14config=true)

void

EmbedMultipleConfs (ROMol &mol, INT_VECT &res, unsigned int numConfs=10, int numThreads=1, unsigned int maxIterations=30, int seed=-1, bool clearConfs=true, bool useRandomCoords=false, double boxSizeMult=2.0, bool randNegEig=true, unsigned int numZeroFail=1, double pruneRmsThresh=-1.0, const std::map< int, RDGeom::Point3D > *coordMap=nullptr, double optimizerForceTol=1e-3, bool ignoreSmoothingFailures=false, bool enforceChirality=true, bool useExpTorsionAnglePrefs=false, bool useBasicKnowledge=false, bool verbose=false, double basinThresh=5.0, bool onlyHeavyAtomsForRMS=false, unsigned int ETversion=2, bool useSmallRingTorsions=false, bool useMacrocycleTorsions=true, bool useMacrocycle14config=true, unsigned int timeout=0)

INT_VECT

EmbedMultipleConfs (ROMol &mol, unsigned int numConfs=10, unsigned int maxIterations=30, int seed=-1, bool clearConfs=true, bool useRandomCoords=false, double boxSizeMult=2.0, bool randNegEig=true, unsigned int numZeroFail=1, double pruneRmsThresh=-1.0, const std::map< int, RDGeom::Point3D > *coordMap=nullptr, double optimizerForceTol=1e-3, bool ignoreSmoothingFailures=false, bool enforceChirality=true, bool useExpTorsionAnglePrefs=false, bool useBasicKnowledge=false, bool verbose=false, double basinThresh=5.0, bool onlyHeavyAtomsForRMS=false, unsigned int ETversion=2, bool useSmallRingTorsions=false, bool useMacrocycleTorsions=false, bool useMacrocycle14config=false, unsigned int timeout=0)

| This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

## Variables

RDKIT_DISTGEOMHELPERS_EXPORT const EmbedParameters | KDG
| Parameters corresponding to Sereina Riniker's KDG approach.
RDKIT_DISTGEOMHELPERS_EXPORT const EmbedParameters | ETDG
| Parameters corresponding to Sereina Riniker's ETDG approach.
RDKIT_DISTGEOMHELPERS_EXPORT const EmbedParameters | ETDGv2
| Parameters corresponding to Sereina Riniker's ETDG approach - version 2.
RDKIT_DISTGEOMHELPERS_EXPORT const EmbedParameters | ETKDG
| Parameters corresponding to Sereina Riniker's ETKDG approach.
RDKIT_DISTGEOMHELPERS_EXPORT const EmbedParameters | ETKDGv2
| Parameters corresponding to Sereina Riniker's ETKDG approach - version 2.
RDKIT_DISTGEOMHELPERS_EXPORT const EmbedParameters | ETKDGv3
RDKIT_DISTGEOMHELPERS_EXPORT const EmbedParameters | srETKDGv3

## Enumeration Type Documentation

## EmbedFailureCauses

enum RDKit::DGeomHelpers::EmbedFailureCauses

Enumerator
INITIAL_COORDS |
FIRST_MINIMIZATION |
CHECK_TETRAHEDRAL_CENTERS |
CHECK_CHIRAL_CENTERS |
MINIMIZE_FOURTH_DIMENSION |
ETK_MINIMIZATION |
FINAL_CHIRAL_BOUNDS |
FINAL_CENTER_IN_VOLUME |
LINEAR_DOUBLE_BOND |
BAD_DOUBLE_BOND_STEREO |
CHECK_CHIRAL_CENTERS2 |
EXCEEDED_TIMEOUT |
END_OF_ENUM |

Definition at line 25 of file Embedder.h.

## Function Documentation

## collectBondsAndAngles()

RDKIT_DISTGEOMHELPERS_EXPORT void RDKit::DGeomHelpers::collectBondsAndAngles | ( | const ROMol & | mol,
|  | std::vector< std::pair< int, int > > & | bonds,
|  | std::vector< std::vector< int > > & | angles )

generate the vectors of bonds and angles used by (ET)KDG

References RDKIT_DISTGEOMHELPERS_EXPORT.

## EmbedMolecule() [1/2]

int RDKit::DGeomHelpers::EmbedMolecule | ( | ROMol & | mol,
|  | EmbedParameters & | params )

inline

Compute an embedding (in 3D) for the specified molecule using Distance Geometry

Definition at line 221 of file Embedder.h.

References EmbedMultipleConfs().

Referenced by EmbedMolecule().

## EmbedMolecule() [2/2]

int RDKit::DGeomHelpers::EmbedMolecule | ( | ROMol & | mol,
|  | unsigned int | maxIterations = 0,
|  | int | seed = -1,
|  | bool | clearConfs = true,
|  | bool | useRandomCoords = false,
|  | double | boxSizeMult = 2.0,
|  | bool | randNegEig = true,
|  | unsigned int | numZeroFail = 1,
|  | const std::map< int, RDGeom::Point3D > * | coordMap = nullptr,
|  | double | optimizerForceTol = 1e-3,
|  | bool | ignoreSmoothingFailures = false,
|  | bool | enforceChirality = true,
|  | bool | useExpTorsionAnglePrefs = false,
|  | bool | useBasicKnowledge = false,
|  | bool | verbose = false,
|  | double | basinThresh = 5.0,
|  | bool | onlyHeavyAtomsForRMS = false,
|  | unsigned int | ETversion = 2,
|  | bool | useSmallRingTorsions = false,
|  | bool | useMacrocycleTorsions = true,
|  | bool | useMacrocycle14config = true )

inline

Compute an embedding (in 3D) for the specified molecule using Distance Geometry

The following operations are performed (in order) here:

1. Build a distance bounds matrix based on the topology, including 1-5 distances but not VDW scaling
2. Triangle smooth this bounds matrix
3. If step 2 fails - repeat step 1, this time without 1-5 bounds and with vdW scaling, and repeat step 2
4. Pick a distance matrix at random using the bounds matrix
5. Compute initial coordinates from the distance matrix
6. Repeat steps 3 and 4 until maxIterations is reached or embedding is successful
7. Adjust initial coordinates by minimizing a Distance Violation error function NOTE**: if the molecule has multiple fragments, they will be embedded separately, this means that they will likely occupy the same region of space.
   Parameters

     mol | Molecule of interest
     maxIterations | Max. number of times the embedding will be tried if coordinates are not obtained successfully. The default value is 10x the number of atoms.
     seed | provides a seed for the random number generator (so that the same coordinates can be obtained for a molecule on multiple runs). If negative, the RNG will not be seeded.
     clearConfs | Clear all existing conformations on the molecule
     useRandomCoords | Start the embedding from random coordinates instead of using eigenvalues of the distance matrix.
     boxSizeMult | Determines the size of the box that is used for random coordinates. If this is a positive number, the side length will equal the largest element of the distance matrix times `boxSizeMult`. If this is a negative number, the side length will equal `-boxSizeMult` (i.e. independent of the elements of the distance matrix).
     randNegEig | Picks coordinates at random when a embedding process produces negative eigenvalues
     numZeroFail | Fail embedding if we find this many or more zero eigenvalues (within a tolerance)

     coordMap

     a map of int to Point3D, between atom IDs and their locations their locations. If this container is provided, the coordinates are used to set distance constraints on the embedding. The resulting conformer(s) should have distances between the specified atoms that reproduce those between the points in `coordMap`. Because the embedding produces a molecule in an arbitrary reference frame, an alignment step is required to actually reproduce the provided coordinates.

     optimizerForceTol | set the tolerance on forces in the distgeom optimizer (this shouldn't normally be altered in client code).
     ignoreSmoothingFailures | try to embed the molecule even if triangle bounds smoothing fails
     enforceChirality | enforce the correct chirality if chiral centers are present
     useExpTorsionAnglePrefs | impose experimental torsion-angle preferences
     useBasicKnowledge | impose "basic knowledge" terms such as flat aromatic rings, ketones, etc.
     verbose | print output of experimental torsion-angle preferences
     basinThresh | set the basin threshold for the DGeom force field, (this shouldn't normally be altered in client code).
     onlyHeavyAtomsForRMS | only use the heavy atoms when doing RMS filtering
     ETversion | version of torsion preferences to use
     useSmallRingTorsions | optional torsions to improve small ring conformer sampling
     useMacrocycleTorsions | optional torsions to improve macrocycle conformer sampling
     useMacrocycle14config | If 1-4 distances bound heuristics for macrocycles is used

   Returns
     ID of the conformer added to the molecule, -1 if the emdedding failed

Definition at line 304 of file Embedder.h.

References EmbedMolecule().

## EmbedMultipleConfs() [1/4]

RDKIT_DISTGEOMHELPERS_EXPORT void RDKit::DGeomHelpers::EmbedMultipleConfs | ( | ROMol & | mol,
|  | INT_VECT & | res,
|  | unsigned int | numConfs,
|  | EmbedParameters & | params )

Embed multiple conformations for a molecule.

References RDKIT_DISTGEOMHELPERS_EXPORT.

Referenced by EmbedMolecule(), EmbedMultipleConfs(), EmbedMultipleConfs(), and EmbedMultipleConfs().

## EmbedMultipleConfs() [2/4]

void RDKit::DGeomHelpers::EmbedMultipleConfs | ( | ROMol & | mol,
|  | INT_VECT & | res,
|  | unsigned int | numConfs = 10,
|  | int | numThreads = 1,
|  | unsigned int | maxIterations = 30,
|  | int | seed = -1,
|  | bool | clearConfs = true,
|  | bool | useRandomCoords = false,
|  | double | boxSizeMult = 2.0,
|  | bool | randNegEig = true,
|  | unsigned int | numZeroFail = 1,
|  | double | pruneRmsThresh = -1.0,
|  | const std::map< int, RDGeom::Point3D > * | coordMap = nullptr,
|  | double | optimizerForceTol = 1e-3,
|  | bool | ignoreSmoothingFailures = false,
|  | bool | enforceChirality = true,
|  | bool | useExpTorsionAnglePrefs = false,
|  | bool | useBasicKnowledge = false,
|  | bool | verbose = false,
|  | double | basinThresh = 5.0,
|  | bool | onlyHeavyAtomsForRMS = false,
|  | unsigned int | ETversion = 2,
|  | bool | useSmallRingTorsions = false,
|  | bool | useMacrocycleTorsions = true,
|  | bool | useMacrocycle14config = true,
|  | unsigned int | timeout = 0 )

inline

This is kind of equivalent to calling EmbedMolecule multiple times - just that the bounds matrix is computed only once from the topology NOTE**: if the molecule has multiple fragments, they will be embedded separately, this means that they will likely occupy the same region of space.

Parameters

  mol | Molecule of interest
  res | Used to return the resulting conformer ids
  numConfs | Number of conformations to be generated
  numThreads | Sets the number of threads to use (more than one thread will only be used if the RDKit was built with multithread support). If set to zero, the max supported by the system will be used.
  maxIterations | Max. number of times the embedding will be tried if coordinates are not obtained successfully. The default value is 10x the number of atoms.
  seed | provides a seed for the random number generator (so that the same coordinates can be obtained for a molecule on multiple runs). If negative, the RNG will not be seeded.
  clearConfs | Clear all existing conformations on the molecule
  useRandomCoords | Start the embedding from random coordinates instead of using eigenvalues of the distance matrix.
  boxSizeMult | Determines the size of the box that is used for random coordinates. If this is a positive number, the side length will equal the largest element of the distance matrix times `boxSizeMult`. If this is a negative number, the side length will equal `-boxSizeMult` (i.e. independent of the elements of the distance matrix).
  randNegEig | Picks coordinates at random when a embedding process produces negative eigenvalues
  numZeroFail | Fail embedding if we find this many or more zero eigenvalues (within a tolerance)

  pruneRmsThresh

  Retain only the conformations out of 'numConfs' after embedding that are at least this far apart from each other. RMSD is computed on the heavy atoms. Pruning is greedy; i.e. the first embedded conformation is retained and from then on only those that are at least pruneRmsThresh away from already retained conformations are kept. The pruning is done after embedding and bounds violation minimization. No pruning by default.

  coordMap

  a map of int to Point3D, between atom IDs and their locations their locations. If this container is provided, the coordinates are used to set distance constraints on the embedding. The resulting conformer(s) should have distances between the specified atoms that reproduce those between the points in `coordMap`. Because the embedding produces a molecule in an arbitrary reference frame, an alignment step is required to actually reproduce the provided coordinates.

  optimizerForceTol | set the tolerance on forces in the DGeom optimizer (this shouldn't normally be altered in client code).
  ignoreSmoothingFailures | try to embed the molecule even if triangle bounds smoothing fails
  enforceChirality | enforce the correct chirality if chiral centers are present
  useExpTorsionAnglePrefs | impose experimental torsion-angle preferences
  useBasicKnowledge | impose "basic knowledge" terms such as flat aromatic rings, ketones, etc.
  verbose | print output of experimental torsion-angle preferences
  basinThresh | set the basin threshold for the DGeom force field, (this shouldn't normally be altered in client code).
  onlyHeavyAtomsForRMS | only use the heavy atoms when doing RMS filtering
  ETversion | version of torsion preferences to use
  useSmallRingTorsions | optional torsions to improve small ring conformer sampling
  useMacrocycleTorsions | optional torsions to improve macrocycle conformer sampling
  useMacrocycle14config | If 1-4 distances bound heuristics for macrocycles is used

Definition at line 402 of file Embedder.h.

References EmbedMultipleConfs().

## EmbedMultipleConfs() [3/4]

INT_VECT RDKit::DGeomHelpers::EmbedMultipleConfs | ( | ROMol & | mol,
|  | unsigned int | numConfs,
|  | EmbedParameters & | params )

inline

Definition at line 212 of file Embedder.h.

References EmbedMultipleConfs().

## EmbedMultipleConfs() [4/4]

INT_VECT RDKit::DGeomHelpers::EmbedMultipleConfs | ( | ROMol & | mol,
|  | unsigned int | numConfs = 10,
|  | unsigned int | maxIterations = 30,
|  | int | seed = -1,
|  | bool | clearConfs = true,
|  | bool | useRandomCoords = false,
|  | double | boxSizeMult = 2.0,
|  | bool | randNegEig = true,
|  | unsigned int | numZeroFail = 1,
|  | double | pruneRmsThresh = -1.0,
|  | const std::map< int, RDGeom::Point3D > * | coordMap = nullptr,
|  | double | optimizerForceTol = 1e-3,
|  | bool | ignoreSmoothingFailures = false,
|  | bool | enforceChirality = true,
|  | bool | useExpTorsionAnglePrefs = false,
|  | bool | useBasicKnowledge = false,
|  | bool | verbose = false,
|  | double | basinThresh = 5.0,
|  | bool | onlyHeavyAtomsForRMS = false,
|  | unsigned int | ETversion = 2,
|  | bool | useSmallRingTorsions = false,
|  | bool | useMacrocycleTorsions = false,
|  | bool | useMacrocycle14config = false,
|  | unsigned int | timeout = 0 )

inline

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Definition at line 426 of file Embedder.h.

References EmbedMultipleConfs().

## initBoundsMat() [1/2]

RDKIT_DISTGEOMHELPERS_EXPORT void RDKit::DGeomHelpers::initBoundsMat | ( | DistGeom::BoundsMatPtr | mmat,
|  | double | defaultMin = 0.0,
|  | double | defaultMax = 1000.0 )

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

References RDKIT_DISTGEOMHELPERS_EXPORT.

## initBoundsMat() [2/2]

RDKIT_DISTGEOMHELPERS_EXPORT void RDKit::DGeomHelpers::initBoundsMat | ( | DistGeom::BoundsMatrix * | mmat,
|  | double | defaultMin = 0.0,
|  | double | defaultMax = 1000.0 )

Set default upper and lower distance bounds in a distance matrix.

Parameters

  mmat | pointer to the bounds matrix to be altered
  defaultMin | default value for the lower distance bounds
  defaultMax | default value for the upper distance bounds

References RDKIT_DISTGEOMHELPERS_EXPORT.

## setTopolBounds() [1/2]

RDKIT_DISTGEOMHELPERS_EXPORT void RDKit::DGeomHelpers::setTopolBounds | ( | const ROMol & | mol,
|  | DistGeom::BoundsMatPtr | mmat,
|  | bool | set15bounds = true,
|  | bool | scaleVDW = false,
|  | bool | useMacrocycle14config = false,
|  | bool | forceTransAmides = true )

Set upper and lower distance bounds between atoms in a molecule based on topology

This consists of setting 1-2, 1-3 and 1-4 distance based on bond lengths, bond angles and torsion angle ranges. Optionally 1-5 bounds can also be set, in particular, for path that contain rigid 1-4 paths. The final step involves setting lower bound to the sum of the vdW radii for the remaining atom pairs.

Parameters

  mol | The molecule of interest
  mmat | Bounds matrix to the bounds are written
  set15bounds | If true try to set 1-5 bounds also based on topology
  scaleVDW | If true scale the sum of the vdW radii while setting lower bounds so that a smaller value (0.7*(vdw1 + vdw2) ) is used for paths that are less five bonds apart.
  useMacrocycle14config | If 1-4 distances bound heuristics for macrocycles is used Note For some strained systems the bounds matrix resulting from setting 1-5 bounds may fail triangle smoothing. In these cases it is recommended to back out and recompute the bounds matrix with no 1-5 bounds and with vdW scaling.

References RDKIT_DISTGEOMHELPERS_EXPORT.

## setTopolBounds() [2/2]

RDKIT_DISTGEOMHELPERS_EXPORT void RDKit::DGeomHelpers::setTopolBounds | ( | const ROMol & | mol,
|  | DistGeom::BoundsMatPtr | mmat,
|  | std::vector< std::pair< int, int > > & | bonds,
|  | std::vector< std::vector< int > > & | angles,
|  | bool | set15bounds = true,
|  | bool | scaleVDW = false,
|  | bool | useMacrocycle14config = false,
|  | bool | forceTransAmides = true )

References RDKIT_DISTGEOMHELPERS_EXPORT.

## updateEmbedParametersFromJSON()

RDKIT_DISTGEOMHELPERS_EXPORT void RDKit::DGeomHelpers::updateEmbedParametersFromJSON | ( | EmbedParameters & | params,
|  | const std::string & | json )

update parameters from a JSON string

References RDKIT_DISTGEOMHELPERS_EXPORT.

## Variable Documentation

## ETDG

RDKIT_DISTGEOMHELPERS_EXPORT const EmbedParameters RDKit::DGeomHelpers::ETDG

extern

Parameters corresponding to Sereina Riniker's ETDG approach.

## ETDGv2

RDKIT_DISTGEOMHELPERS_EXPORT const EmbedParameters RDKit::DGeomHelpers::ETDGv2

extern

Parameters corresponding to Sereina Riniker's ETDG approach - version 2.

## ETKDG

RDKIT_DISTGEOMHELPERS_EXPORT const EmbedParameters RDKit::DGeomHelpers::ETKDG

extern

Parameters corresponding to Sereina Riniker's ETKDG approach.

## ETKDGv2

RDKIT_DISTGEOMHELPERS_EXPORT const EmbedParameters RDKit::DGeomHelpers::ETKDGv2

extern

Parameters corresponding to Sereina Riniker's ETKDG approach - version 2.

## ETKDGv3

RDKIT_DISTGEOMHELPERS_EXPORT const EmbedParameters RDKit::DGeomHelpers::ETKDGv3

extern

Parameters corresponding improved ETKDG by Wang, Witek, Landrum and Riniker (10.1021/acs.jcim.0c00025) - the macrocycle part

## KDG

RDKIT_DISTGEOMHELPERS_EXPORT const EmbedParameters RDKit::DGeomHelpers::KDG

extern

Parameters corresponding to Sereina Riniker's KDG approach.

## srETKDGv3

RDKIT_DISTGEOMHELPERS_EXPORT const EmbedParameters RDKit::DGeomHelpers::srETKDGv3

extern

Parameters corresponding improved ETKDG by Wang, Witek, Landrum and Riniker (10.1021/acs.jcim.0c00025) - the small ring part