[InChI-discuss] InChI standard valences?

[Reinhard D. <du...@sc...>]

I am looking at Appendix 1 "InChI Standard Valences" of "The IUPAC Chemical 
Identifier - Technical Manual". Very useful! So N and O+ can have three 
valences. But how could they also have five valences, as stated? Wasn't it 
called the "Octet Rule": atoms in the periodic system row Li through Ne can 
have a maximum of four bonds? PubChem strictly specifies an -NO2 group with 
separated charges, instead of two double bonds to both oxygens. I don't 
remember having seen an O+ specified with five valences.

Surprising is also that Appendix 1 specifies an uncharged S with four 
valences should not be bonded to a hydrogen (marked with a star in the 
appendix). Bleomycin 
(http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=2411) would 
violate this assumption. Do these "Standard Valences" influence a created 
InChI?

ThanX
Reinhard