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  • Checker searches for valence errors.
  • Fixer offers removing explicit hydrogens if applicable (fixvalence).


Example :

Valence Error Checker (valenceerror)Warning:Fix
Fix Valence (fixvalence)
Detect Valence Errorex_valence_chno error
ex_valence_chex_valence_f
ex_valence_chnot available
Detect Valence Error:
Allow traditional N representation
(:allowTraditionalNitrogen=true)
ex_valence_chnot available


Note : Valence errors with no removable hydrogens have to be corrected manually.

Current limitation: If an R group definition contains an S group with valence error inside, the checker reports about the problem but no fixer is applied (even if the valence error could be eliminated with H removal).