prov:value
| - R6c and R6d: the same or different, a hydrogen atom, a lower alkyl, or a halogen-substituted lower alkyl, and R7c, R5c, R7d, and R8d: the same or different, a hydrogen atom, a halogen atom, a lower alkyl, or a halogen-substituted lower alkyl. [6] The compound according to the above [1], wherein R1 to R5 are the same or different and each is a hydrogen atom, a halogen, a halogen-substituted lower a
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