prov:value
| - R2 is preferably a substituted or unsubstituted C1 -C10 alkyl or aryl group, especially methyl, ethyl, propyl, gammatrifluoropropyl, phenyl, or benzyl group, and R4 is a substituted or unsubstituted C1 -C10 alkyl or aryl group, especially ethyl, propyl, and benzyl, or a C1 -C20 acyl group, especially acetyl, myristyl, palmityl, oleyl, glycyl, lysyl, or benzoyl, or a hydrogen atom (--H) or alkali m
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