| http://www.w3.org/ns/prov#value | - the radicals R3 are identical or different and are each a halogen atom, a C1 -C20 -hydrocarbon group such as a C1 -C10 -alkyl group, a C1 -C10 -alkenyl group, a C6 -C10 -aryl group or a NR16 2 --, --SR16, --OSiR16 3, --SiR16 3 or PR16 2 radical, where R16 is a halogen atom, a C1 -C10 -alkyl group or a C6 -C10 -aryl group, R4 to R12 are identical or different and are as defined for R3 or two or mor
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