prov:value
| - The radicals R3 to R12 are identical or different and are a hydrogen atom, a halogen atom, preferably fluorine, chlorine or bromine, a C1-C10-, preferably C1-C4-alkyl group, which may be halogenated, a C6-C10-, preferably C6-C8-aryl group, an ???NR16 2, ???SR16, ???OSiR16 3, ???SiR16 3 or ???PR16 2 radical, where R16 can be a halogen atom, preferably chlorine, or a C1-C10, preferably C1-C4-alkyl g
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