| http://www.w3.org/ns/prov#value | - l), alkoxyalkyl, carboxyamidoalkyl, and combinations thereof; and in the case where X0 and X1 are both O, R1 is preferably H (to thereby define a carboxylic acid) or alkyl (to thereby define an ester);R2 is selected from the group consisting of H, alkyl, alkenyl, alkynyl, aryl, alkylaryl, heteroaryl, alkoxy, aryloxy, thioalkoxy, and combinations thereof; preferably R2 is H or lower alkyl such as m
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