Metals: facts, factoids and some not quite related stuff too
I have seen a lot of such problems, no clue how they were lost, but I did observe inconsistent behaviour in the ASN and MDL molfiles you can download for entries, the former looking 'chemically better'. File formats are a known source of problems, and it is not uncommon the cheminformatics tools guess wrongly on missing information in those formats.Regarding hydrogens, as several other Blue Obelisk members advocate too: always use explicit hydrogens! Those are much harder to loose :)
Sure, I always try to draw hydrogens, especially in non-standard cases. However, the second example shows added hydrogens, and this is difficult to prevent!
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