prov:value
| - R3 and R4 are identical or different, preferably identical, and are a halogen atom, preferably a chlorine, bromine or iodine atom, a C1 -C10 -, preferably C1 -C6 -alkyl group, which can be halogenated, a C6 -C10 -, preferably C6 -C8 -aryl group or an --NR2 10, --SR10, --OSiR3 10, --SiR3 10 or --PR2 10 radical in which R10 is a halogen atom, preferably a chlorine atom, or a C1 -C10 -, preferably C1
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