prov:value
| - wherein R1 is a hydrogen, alkyl, aryl, alkylaryl, acetyl, or heteroatoms; R2 is a hydrogen, alkyl, aryl, alkylaryl, acetyl, or heteroatoms; R3 is hydrogen, alkyl, aryl, alkylaryl, acetyl, alkoxyl, benzoyl, or heteroatoms; or a group comprising an anionic group, a cationic group, or a non-ionic group; R4 is a group such as H, Na, K, or Li, or a group comprising an anionic group, a cationic group, o
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