prov:value
| - M2 is carbon or silicon, in particular silicon, R8 and R9 are identical or different and are hydrogen, (C1 -C6)alkyl, (C6 -C10)aryl, (C1 -C6)alkoxy, (C2 -C4)alkenyl, (C7 -C10)arylalkyl or (C7 -C10)alkylaryl, or R8 and R9, together with the atom joining them, form a ring, p is 1 or 2, preferably 1, and R10 and R11 are identical or different and are hydrogen, (C1 -C3)alkyl, in particular methyl, (C1
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