prov:value
| - atom, C1-C40-group which may be halogenated, ???SiR9 3, ???NR9 2, ???Si(OR9)3, ???Si(SR9)3 or ???PR9 2, where R9 identical or different and are each a halogen atom, a C1-C8-alkyl group or a C6-C10-aryl group, R4 are identical or different and are each a hydrogen atom, a C1-C40-group an OH group, a halogen atom or NR10 2, where R1 is a halogen atom, a C1-C10-alkyl group or a C6-C10-aryl group, or
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