| http://www.w3.org/ns/prov#value | - wherein the average number ratio of z to x is within the range of from 1:200 to 1:6, more preferably from 1:100 to 1:8, most preferably from 1:50 to 1:12, e.g. 1:30 to 1:14, y is the residual acetate remaining from the hydrolysis of the parent compound, which is preferably in the range of from 1-20%, more preferably 1-10%, most preferably 1-5% and R is an alkyl or alkenyl group having from 3 to 2
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