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
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