prov:value
| - n which R1, R2, R3 and R4 each is an alkyl group which may have a substituent, an aryl group which may have a substituent or a halogen atom; a and b each is an integer of 0 to 4; c and d each is an integer of 0 to 3; and p is an integer of 0 or 1, and when p=1, A is a straight-chain alkylene group having 2 to 12 carbon atoms, --O--, --S--, --SO--, --SO2 --, --CO--, ##STR5## in which Z1 and Z2 each
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