OEFPBondType¶

This namespace contains bond typing options that can be used when generating Circular, Path of Tree fingerprints. Bond type options control how the bonds of the enumerated circular, path or tree fragments are encoded during the fingerprint generation.

The OEFPBondType namespace contains the following constants:

BondOrder

This flag indicates that bond order information is encoded into the generated fingerprint, i.e., if two fragments (either circular, path or tree) are composed of bonds with different bond orders (the value returned by the GetOrder method) then the two fragments will be mapped to different bits of the fingerprint. Table: Example of using the BondOrder option demonstrates the effect of using the OEFPBondType.BondOrder flag.

Example of using the OEFPBondType.BondOrder option (Path, numbits=4096, bonds=0-5, atom typing = AtomicNumber).

Chiral

This flag indicates that chiral and non-chiral bonds (the value returned by the OEBondBase.IsChiral method) are distinguished during the circular, path, the tree fingerprint generation. Table: Example of using the Chiral option demonstrates the effect of using the OEFPBondType.Chiral flag.

Example of using the OEFPBondType.Chiral option (Path, numbits=4096, bonds=0-5, atom typing = AtomicNumber).

Example of molecule similarity of cis-trans stereoisomers

InRing

This flag indicates that bond topology information is encoded into the generated fingerprint, i.e., if two fragments (either circular, path or tree) are composed of bonds with different bond topology (the value returned by the OEBondBase.IsInRing method) then the two fragments will be mapped to different bits of the fingerprint.

Table: Example of using the InRing option demonstrates the effect of using the OEFPBondType.InRing flag.

Example of using the OEFPBondType.InRing option (Path, numbits=4096, bonds=0-5, atom typing = AtomicNumber).

DefaultBond

Same as OEFPBondType.DefaultPathBond constant.

DefaultCircularBond

Same as the OEFPBondType.BondOrder constant.

See example in Figure: Circular fingerprint similarity with default circular atom and bond typing. This constant is used as bond typing parameter when a default Circular fingerprint is generated by the following functions:

• OEMakeFP (OEFingerPrint &, const OEMolBase &, OEFPType.Circular)
• OEMakeCircularFP

DefaultPathBond

The bitwise OR’d value of the following bond typing options:

• OEFPBondType.BondOrder
• OEFPBondType.Chiral

See example in Figure: Path fingerprint similarity with default path atom and bond typing. This constant is used as bond typing parameter when a default Path fingerprint is generated by the following functions:

• OEMakeFP (OEFingerPrint &, const OEMolBase &, OEFPType.Path)
• OEMakePathFP

Path fingerprint similarity with default tree atom and bond typing

DefaultTreeBond

Same as the OEFPBondType.BondOrder constant.

See example in Figure: Tree fingerprint similarity with default tree atom and bond typing. This constant is used as bond typing parameter when a default Tree fingerprint is generated by the following functions:

• OEMakeFP (OEFingerPrint &, const OEMolBase &, OEFPType.Tree)
• OEMakeTreeFP

Tree fingerprint similarity with default tree atom and bond typing

None

No bond properties are encoded when generating a fingerprint.