| http://www.w3.org/ns/prov#value | - In the above chemical formula, each of A1 to A6 which are independent of one another, is a hydrogen atom, a halogen atom, a nitro group, a hydroxyl group, a cyano group, a C1-12 alkyl group, a C1-12 alkoxy group, an aryl group, an aryloxy group, an acyl group, an arylamine group, an aralkyl group, an alkylamino group or a monovalent aromatic hydrocarbon group, M is a metal atom, m is an integer of
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