prov:value
| - Ra, Ra???, Rb, Rb???, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, 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 ammonium group, an alkyl group optionally having one or more substituents, an alkenyl group optionally having one or more substituents, an alkynyl group optionally having one or more substitu
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