| http://www.w3.org/ns/prov#value | - R5 to R8 are identical or different and are a hydrogen atom, a C1 -C10 -alkyl group, a C6 -C20 -aryl group or a SiR15 3 radical, where R15 is a C1 -C10 -alkyl group, or the radicals R5 and R6 and/or R7 and R8 together with the atoms connecting them form an aromatic or aliphatic ring system,
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