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OEFormat::MDL format files using the OEWriteMDLFile
function.
The OEOFlavor::MDL::PMask set of bits controls the processing
of the MDL stereo parity bit field of each atom. The default
behaviour, with just the OEOFlavor::MDL::MDLParity flag set,
is to call the function OEMDLPerceiveParity if the function
OEMDLHasParity returns false. This determines the
parity bit from OEChem's perceived stereochemistry if the MDL parity
bits haven't already been set. Alternatively, the
OEOFlavor::MDL::NoParity flag, instructs the high level writer
to clear the MDL stereo parity field of every atom to zero. Finally,
OEOFlavor::MDL::CurrentParity (or neither MDLParity nor
NoParity) instructs the high-level writer to leave the MDL
parity bits alone.
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