| http://www.w3.org/ns/prov#value | - f counterions in the molecule; for n>1, different counterions M can be involved; sulfoderivatives of fused polycyclic heteroaromatic compounds comprising five or six members with N or O or both (pyrrole, pyridine, oxazole, furan, oxazine, azine, chromone, pyridopyrimidine) with the structural formulas XXV-XXVIII: where n is an integer in the range of 1 to 4 and p is an integer in the range of 0 to
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