prov:value
| - 4 carbon atoms, an alkoxycarbonyl group of 2-5 carbon atoms, a dialkylamino group of 1-4 carbon atoms in each alkyl moiety, Cl, Br, CN, NO2 or SO2 CH3, and is preferably a hydrogen atom or a methyl group. ##STR9## wherein R10, R11 and R12 each independently represents methyl, ethyl, propyl or isopropyl groups, preferably R10 and R11 are a methyl group and R12 is a ethyl group, and R13 and R14 each
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