prov:value
| - A compound as claimed in claim 1, wherien R3 and R4 are identical or different and are a hydrogen atom, a fluorine, chlorine or bromine atom, a C1-C4-alkyl group which may be halogenated, a C6-C8-aryl group, a ???NR2 10, ???SR10, ???OSiR3 10, ???SiR3 10 or ???PR2 10 radical in which R10 is a chlorine atom, or a C1-C3 alkyl group or a C6-C8-aryl group.
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