prov:value
| - R3 and R4 are identical or different and are a hydrogen atom, a halogen atom, a C1 -C10 -alkyl group, which is optionally halogenated, a C6 -C10 -aryl group, an --NR2 10, --SR10, --OSiR3 10. --SiR3 10 or --PR2 10 radical in which R10 is a halogen atom, a C1 -C10 -alkyl group or a C6 -C10 -aryl group, R5 and R6 are identical or different and are as defined for R3 and R4, with the proviso that R5 a
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