prov:value
| - integer ranging from 1 to 8; M is a metal (Na, K, Li, etc); and X??? is a halide anion or an anion derived from a mineral or organic acid; HG(Ar)???, where??? represents a bond to a carbon component, HG is a hydrophilic group selected from OR, COR, COOR, OCOR, COOM, halogens, CN, NR2, SN, SO3H, SO3M, NR(COR), CONR2, NO2, PO3H2, PO3HM, NR3+X???, and PR3+X???, where R is independently selected from
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