prov:value
| - l group or a C6 -C10 -aryl group, R5 and R6 are identical or different and are a hydrogen atom, a halogen atom, a C1 -C10 -alkyl group which optionally are halogenated, a C6 -C10 -aryl group, or a --NR2 10, --SR10, --OSiR3 10, --SiR3 10 or --PR2 10 radical, in which R10 is a halogen atom, a C1 -C10 -alkyl group or a C6 -C10 -aryl group, with the proviso that both R5 and R6 are not hydrogen, R7 is
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