prov:value
| - R5, R6, R9, R10, R11, R12, R13 and R14 may be the same or different and each are a hydrogen atom or a C1 -C18, preferably C1 -C12, more preferably C1 -C8 hydrocarbon group including an alkyl group such as methyl, ethyl, propyl, isopropyl, cyclopropyl, butyl, isobutyl, t-butyl, pentyl, isopentyl, neopentyl, cyclopentyl, hexyl, isohexyl, cyclohexyl, heptyl, octyl, decyl and dodecyl; an alkenyl group
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