| http://www.w3.org/ns/prov#value | - R1 and R4 are the same or different alkyl groups having 1 to 30 carbon atoms or alkenyl groups, R2 and R3 are the same or different alkylene groups having 1 to 30 carbon atoms or alkenylene groups, m is an integer of 0 to 5, and n is an integer of 1 to 10,
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