prov:value
| - In formula (III) the R' and R groups can each independently represent a hydrogen atom or a halogen atom, such as chlorine or bromine, a C1 -C8 alkyl group such as, for example, methyl, ethyl, butyl, isopropyl, isoamyl, octyl, benzyl, a C3 -C12 alkylsilyl group such as, for example, trimethylsilyl, triethylsilyl or tributylsilyl, a cycloalkyl group such as cyclopentyl or cyclohexyl, a C6 -C10 aryl
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