prov:value
| - arbon atoms or an optionally substituted aryl, heteroaryl or aralkyl radical, R8 and R9, independently of one another, mean a hydrogen atom, a straight-chain or branched-chain, saturated or unsaturated, optionally partially or completely halogenated hydrocarbon radical with up to 10 carbon atoms, a group ???X???R18, in which X is an oxygen or sulfur atom, and R18 has the meaning that is indicated
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