| http://www.w3.org/ns/prov#value | - Z is selected from the group consisting of a covalent bond, oxygen, sulfur,-S (=O)-,- C (=O)-,- (O=) S (=O)-, and-N (R)-, where R is aryl (of about 6 to about 20 carbons, such as phenyl), acyl (of about 2 to about 20 carbons, such as acetyl, benzoyl, and so forth), a carbon-to-carbon bond, or- (R4-) C (-R5)-, where R4 and Rs are independently selected from the group consisting of hydrogen, allcyl
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