| http://www.w3.org/ns/prov#value | - (R2COOCH2)3C???CH2-O???CH2-C(CH2-OCOR2)3???(5) In the above formulas (1) to (5), R1 is H or an alkyl group having 1 to 3 carbon atoms, R2 is a straight-or branched-chain alkyl group having 5 to 12 carbon atoms, R3 is an alkyl group having 1 to 3 carbon atoms, and n is an integer of 0 to 5.
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