prov:value
| - In another aspect, R1 is R, OH, SH, NH2, OR, SR or NHR, where R is optionally substituted C1-C12 alkyl, C1-C12 alkenyl, C1-C12 alkynyl, or aryl C1-C12 alkyl, containing 0-4 heteroatoms in place of a carbon in the carbon backbone, where the optional substituents are ???O, ???N, or OH. Preferably, R is a lower alkyl, preferably Cl-6, more preferably Cl-3 alkyl, and even more preferably, methyl, ethy
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