prov:value
| - (examples of the substituent include an alkoxy group, a phenyl group, a naphthyl group, an amino group, an alkylamino group, an acyl group, an alkoxycarbonyl group, an acyloxy group or the like); and B represents a group selected from the group consisting of --CR7 R8 --, --O--, --S-- and --CO-- (each of R7 and R8 is a group selected from the group consisting of a hydrogen atom, an alkyl group, an
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