• Checker searches for valence errors.

  • Allow traditional N representation: checking this option will allow the presence of pentavalent nitrogen. Details on valence calculation of nitrogen (:allowTraditionalNitrogen=true)

• Fixer offers removing explicit hydrogens if applicable (fixvalence).

Example :

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).