prov:value
| - R3 and R4 are identical or different and are a hydrogen atom, a halogen atom, preferably a fluorine, chlorine or bromine atom, a C1 -C10 -, preferably C1 -C4 -alkyl group, which may be halogenated, a C6 -C10 -, preferably C6 -C8 -aryl group, an --NR2 15, --SR15, --OSiR3 15, --SiR3 15 or --PR2 15 radical in which R15 is a halogen atom, preferably a chlorine atom, or a C1 -C10 -, preferably C1 -C3 -
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