| http://www.w3.org/ns/prov#value | - alkyl group, R5 is a lower alkyl group, n is an integer from 20 to 500, and R4 is a monovalent radical selected from the group consisting of --C6 H4 R6 and --CO2 R7 wherein R6 is a hydrogen atom or a lower alkyl group and R7 is a lower alkyl group.
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