OEChem now supports the creation of InChI. OEChem produces the same InChI as the InChI library provided application for 99.77% of MDDR in the SDF format. The differences fall into two categories:
Corrupted molecules where the tools have to make arbitrary decisions about how to correctly interpret the data.
Bond stereo being perceived by the InChI application where bond stereo does not actually exist. OEChem does not assign bond stereo and generates what appears to be a more “correct” InChI for these cases.
The inclusion of InChI support added the following:
In addition, oemolostream will automatically write InChI when using the
OEPrepareSearchadded that perceives atom and bond properties of a molecule that are necessary to successfully execute a given substructure search. It is now highly recommended to run this function on a molecule before passing the molecule to any of OEChem’s graph matching algorithms.
OEWriteMDLFilewrites MDL enhanced stereo groups.
OEWriteMDLFilewill now automatically write a molecule in the V3000 file format if it has more than 999 atoms or if it has any MDL enhanced stereo group regardless of the given file format flavor.
Added the following standard SYBYL atom types:
OETriposType_Zn. Atoms for which no SYBYL atom type exists are still internally handled with the
OETriposType_Dutype, however when writing these atoms into a
MOL2file their atomic symbol is written to the SYBYL atom type column instead of a string “Du”.
OEGetDimensionFromCoordsfunction that returns the dimension of the molecule from its coordinates.
Residue information is now retained when reading files with MacroModel formats (.mmod, .mmd, and .dat).
Major bug fixes¶
It used to be possible to perform a substructure search for stereochemistry or hybridization on a molecule that did not yet have those properties perceived. This led to very subtle to detect problems where molecules would not match that were expected to match.
To combat this, the following OESubSearch methods now throw warnings in case some property that is necessary to successfully execute the substructure search has not been perceived yet:
These warnings can be suppressed by calling the
OEPrepareSearchfunction on the molecule first.
It is now thread-safe to copy the same OEMol from multiple threads at the same time. This was caused by some OEMCMolBase methods not actually being const. The following methods were marked as const, but were not actually const, leading to subtle race conditions:
OEMCSSearch.AddConstraintnow requires that the constraint is satisfied in all resulting matches. Previously, the documentation stated the following, “Constraints are considered satisfied in subgraphs which do not contain any constrained atoms or bonds in either the pattern or target molecules.” This is no longer the intended behavior.
Minor bug fixes¶
OE3DToBondStereofunction returns false if the molecule dimension is 0, since no cis or trans bonds can be perceived if there are no coordinates.
Adjusted the dimension of a molecule to 0 if it is read from either a
SDFfile with no coordinates.
OE3DToAtomStereofunction throws a warning and returns
falseif any chiral atom of the molecule is not tetrahedral, i.e., if the atom stereo can not be determined from the 3D coordinates, usually because it is flat.
The following functions and methods throw additional warnings in cases where either the
OE3DToBondStereofunctions encounter any problems when assigning stereo from coordinates:
OEPerceiveChiralfunction considers hydrogens with different mass as being different i.e. it will recognize the C atom in a molecule “[3H]C(N)F” as a chiral atom, since it has four different neighbors: N, F, H and 3H.
The first argument of the following methods is not const any longer:
Improved the performance of the following methods:
OEGetTorsionsnow works from Python.
The following functors are now properly wrapped in Python, Java, and C#:
The following functors are now deprecated:
Major bug fixes¶
Calling OEPlatform::oeofstream::append after OEPlatform::oeofstream::open will no longer hang indefinitely once data is written to it.
Minor bug fixes¶
Minor internal improvements.