| http://www.w3.org/ns/prov#value | - p consisting of hydroxy, phenoxy, phenoxy substituted with one or more sulfonic acid or a salt thereof, halo, carbonyl, or carboxylic acid or a salt thereof, or two or more R5 groups together may form a divalent alkenylene chain completing a naphthalene ring which is substituted with one or more polar groups and M is a proton, or other metal or non-metal cation, with the proviso that at least one
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