prov:value
| - R3 and R4 are identical or different and are a hydrogen atom, a halogen atom, a C1-C10-alkyl group, which may be 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,
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