prov:value
| - In the formula (VIIIa) or (VIIIb), each of R9, R10, R12 and R13 independently is an alkyl group (e.g., methyl, ethyl, propyl), an alkoxy group (e.g., methoxy, ethoxy), an aryloxy group (e.g., phenoxy, p-chlorophenoxy), a halogen atom (Cl, Br, F), an alkoxycarbonyl group (e.g., ethoxycarbonyl), a carbon halide group (e.g., trifluoromethyl), an alkylthio group (e.g., methylthio, ethylthio, butylthio
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