| http://www.w3.org/ns/prov#value | - p, an ethoxy group or an aryl group; ##STR23## wherein R3 and R4 each represents an alkyl group, with the proviso that the total number of carbon 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; ##STR24## wherein R5 and R6 each represents an alkyl group, an a
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