prov:value
| - wherein R1 and R2 are independently selected from a hydrogen, an alkyl group such as a substituted or unsubstituted, saturated linear or branched hydrocarbon group or chain (e.g., C1 to C8) including, e.g., methyl, ethyl, isopropyl, tert-butyl, heptyl, n-octyl, dodecyl, octadecyl, amyl, 2-ethylhexyl, an alkoxy group, such as a methoxy group, ethoxy group, propoxy group; R3 is an alkyl group such a
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