prov:value
| - In the polar group shown by ##STR17## Z10 of Z0 represents preferably a hydrocarbon group having from 1 to 18 carbon atoms, and preferred examples of the hydrocarbon group include an aliphatic group having from 1 to 8 carbon atoms, which may be substituted (e.g., methyl, ethyl, propyl, butyl, pentyl, hexyl, butenyl, pentenyl, hexenyl, 2 chloroethyl, 2-cyanoethyl, cyclopentyl, cyclohexyl, benzyl, p
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