| http://www.w3.org/ns/prov#value | - n atom, a methyl group, ethyl group, a methoxy group, an ethoxy group or an aryl group); ##STR4## (wherein R3 and R4 each represents an alkyl group, provided that the total number of the carbon atoms in R3 and R4 is at least 9; Y is a hydrogen atom, a halogen atom, a methyl group, an ethyl group, a methoxy group, an ethoxy group or an aryl group).
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