prov:value
| - where the groups R are identical or different and R is methyl, ethyl, n-propyl, isopropyl, 2-methoxyethyl, or hydrogen, the groups R2 are identical or different, each R2 being a linear, branched, or cyclic alkyl group having from 1 to 18 carbon atoms, for example n-propyl, n-butyl, isobutyl, tert-butyl, n-octyl, isooctyl, or hexadecyl, R3 is a phenyl group, each of d, d???, e and e???, independent
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