Improvements to version 4.61:
SMIRKS:
- Extensions to 4.51 functionality.
- All current valid SMIRKS still valid.
- Semantics remain identical for all well-defined SMIRKS.
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Not enough environment on stereocenter.
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SMARTS atom expression warnings.
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Added/deleted SMILES parts are allowed.
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Atomic SMARTS allowed for reacting center atoms.
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Partially-specified stereochemistry perceived.