group, aryloxy group, carboxyl group including an alkylcarboxyl group and an arylcarboxyl group, alkyl carbonyl group, arylcarbonyl group, or carboxyalkyl group including an alkylcarboxyalkyl group and arylcarboxyalkyl group, t is an integer of 1 to 6 which indicates the number of (CR<1>R<2>OH) group, s is an integer of 0 to 5 which indicates the number of (CHR<1>R<2>) group, and n is an integer o