prov:value
| - In the formula (VIa) or (VIb), each of R9, R10 and R11 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), an ary
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