prov:value
| - R7 is ##STR4## ???BR11, ???AlR11, --Ge--, --Sn--, --O--, --S--, ???SO, ???SO2, ???NR11, ???CO, ???PR11 or ???P(O)R11 in which R11, R12 and R13 are identical or different and are a hydrogen atom, a halogen atom, a C1 -C10 -, preferably C1 -C4 -alkyl group, in particular the methyl group, a C1 -C10 -fluoroalkyl group, preferably the CF3 group, a C6 -C10 -, preferably C6 -C8 -aryl group, a C6 -C10 -f
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