| http://www.w3.org/ns/prov#value | - R12, R13, R14, R15, R16, and R17 may be the same or different and each is a hydrogen atom, a halogen atom, a cyano group, a nitro group, an alkyl group optionally having one or more substituents, an alkenyl group optionally having one or more substituents, or ???ZR18, wherein
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