THe reason for this is that it will prevent ambiguities due to nonstandard,
higher valences. Because of this, it is not possible to infer the implicit
hydrogen count, so it must be specified explicitly. For S and P the
standard valence would be 2 and 3 respectively, just like for O and N. But
S has
I am not a chemist, so it can be a silly question, but I am interested in
the logic behind it, also because other libraries (like OpenBabel) behave
differently.
Why sometimes RDKit writes hydrogens explicitly?
mol = rdkit.MolFromSmiles('CCS=O', sanitize=False)
rdkit.MolToSmiles(mol)
'CC[SH]=O'
T
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