| http://www.w3.org/ns/prov#value | - where R.sub.1 and R.sub.2 are selected from H; a straight- or branched-chain alkyl constituent having from 1 to about 8 carbon atoms; acetyl; vinyl; allyl; hydroxyl; carboxyl; --(CH.sub.2).sub.n --OH, where n is an integer in the range of
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