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