| prov:value
| - from 1 to about 25, and more specifically, from 1 to about 10 carbon atoms, or aryl with, for example, from 6 to about 36 carbon atoms, such as phenyl, naphthyl, or a higher polycyclic aromatic exceeding 36 carbon atoms; R2 is, for example, alkyl, a branched alkyl, cycloalkyl, or aryl, such as phenyl, naphthyl, a higher polycyclic aromatic or R1; and R3 is, for example, alkyl, branched alkyl, cycl
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