| http://www.w3.org/ns/prov#value | - n atoms in the alkyl groups represented by R3 and R4 is 9 or more, and Y is a hydrogen atom, a halogen atom, a methyl group, an ethyl group, a methoxy group, an ethoxy group or an aryl group; ##STR18## wherein R5 and R6 each represents an alkyl group, an alkenyl group, a cycloalkyl group or an aryl group; ##STR19## wherein R7, R8 and R9 each represents an alkyl group, an alkenyl group, a cycloalky
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