| http://www.w3.org/ns/prov#value | - Z is selected from the group consisting of oxygen; sulfur; ##STR4## where R is aryl (of 6 to 20 carbons, such as phenyl) or acyl (of 2 to 20 carbons, such as acetyl, benzoyl, etc.); a carbon-to-carbon bond; or ##STR5## where R1 and R2 are selected from hydrogen, alkyl radicals of 1 to 4 carbons, and alkenyl radicals of 2 to 4 carbons.
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