| 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 more adjacen
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