| http://www.w3.org/ns/prov#value | - R1 and R2 independently represent an alkyl group or an alkenyl group having 10 to 25 carbon atoms; X and Y independently the present one member selected from the group consisting of ???o???, ???S???, ???COO???, ???OCO???, CONH???, and ???HNCO???; m is 0 or 1; and n is an integer of 0 to 6.
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