| http://www.w3.org/ns/prov#value | - hich R represents an alkyl group of 8 to 18 carbon atoms, R is a hydrogen atom or a methyl group, R is a lower alkyl group, A is a chalcogen having an atomic weight of 16 to 32, i.e., oxygen or sulfur, and n is an integer from 3 to about 50.
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