| http://www.w3.org/ns/prov#value | - having from 3 to 22 carbon atoms, an aryl group having from 6 to 22 carbon atoms or an alkylaryl group having from 7 to 22 carbon atoms, and wherein at least one of R4, R5 and R6 represents a substituent other than hydrogen and x, y and z are integers equal to or greater than 1 and a sum of x, y and z is an integer greater than 5.
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