prov:value
| - R5 and R6 are preferably (C1-C4)-alkyl, which may be halogenated, such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl or trifluoromethyl, in particular methyl. ???BR11, ???AlR11, ???Ge???, ???Sn???, ???O???, ???S???, ???SO, ???SO2, ???NR11, ???CO, ???Pr11 or ???P(O)R11, where R11, R12 and R13 are identical or different and are a hydrogen atom, a halogen atom, a C1-C10-, preferably C1-C4-alky
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