| http://www.w3.org/ns/prov#value | - The preferred C monomer includes a Z group which has the general formula ##STR2## wherein R2 is a hydrogen atom or a lower alkyl group, R3 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 ##STR3## and --CO2 R6 wherein R5 is a hydrogen atom or a lower alkyl group and R6 is a lower alkyl group.
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