prov:value
| - R2, R7, R8, R9 and R10 may be the same or different and are a halogen atom, an alkyl group having 6 or less carbon atoms or a phenyl group, R3, R4, R5, R6, R11 and R12 may be the same or different and are a hydrogen atom, a halogen atom, an alkyl group having 6 or less carbon atoms or a phenyl group, A is a linear, branched or cyclic hydrocarbon having 20 or less carbon atoms, each of a and b is 0
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