prov:value
| - R6 is ???BR9, ???AlR9, ???Ge???, ???Sn???, ???O???, ???S???, ???SO, ???SO2, ???NR9, ???CO, ???PR9 or ???P(O)R9, where R9, R10 and R11 are identical or different and are a hydrogen atom, a halogen atom, a C1-C10-, preferably C1-C4-alkyl group, in particular a methyl group, a C1-C10-fluoroalkyl group, preferably a CF3 group, a C6-C10-, preferably C6-C8-aryl group, a C6-C10-fluoroaryl group, preferab
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