| http://www.w3.org/ns/prov#value | - R16, --OSiR16 3, --SiR16 3 or --PR16 2 radical, in which R16 is a halogen atom, a C1 -C10 -alkyl group or a C6 -C10 -aryl group, or adjacent radicals R4 to R12, together with the atoms connecting them, form one or more aromatic or aliphatic rings, or the radicals R6 and R8 or R12, together with the atoms connecting them, form an aromatic or aliphatic ring, R13 is ##STR19## ???BR14, ???AlR14, --Ge-
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