oxycyclohexanecarboxylic acid) ester and the compounds represented by the following formula (1), (2) or (3): ##STR30## wherein R1 is a hydrogen atom, an alkyl group of 1-8 carbon atoms which may have an epoxy group(s), or an acyl group of 1-12 carbon atoms which may have an epoxy group(s); R2 is an alkylene group of 1-6 carbon atoms; and n is an integer of 0-15, ##STR31## wherein two R3 s may be t