| http://www.w3.org/ns/prov#value | - in which n denotes a whole number of amide units such that the number of ester groups represents from 10% to 50% of the total number of the ester and amide groups; each of the R1 symbols independently denotes an alkyl or alkenyl group having at least 4 carbon atoms and in particular from 4 to 24 carbon atoms; each of the R2 symbols independently represents a C4 to C42 hydrocarbonaceous group, prov
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