| http://www.w3.org/ns/prov#value | - With respect to formula 4, the alkyl group represented by R41 is preferably an alkyl group having 1 to 20 carbon atoms, and may have a substituent such as a halogen atom, an aryl group, an aryloxy group, a heterocyclic group, a hydroxyl group, an acyl group, a carbamoyl group, a sulfo group, a sulfonyl group, an alkoxycarbonyl group, a sulfonamide group or a carboxyl group.
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