prov:value
| - R10, R11, R12 and R13 each represents a hydrogen atom or an alkyl, i.e. an unsubstituted or substituted alkyl group such as a straight-chain, branched chain or cyclic alkyl group and moreover, R10, R11, R12 and R13 represents an aryl, i.e., an unsubstituted or substituted aryl group such as a monocyclic, bicyclic or tricyclic aryl group.
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