| http://www.w3.org/ns/prov#value | - R4 ' has, with the exception of the hydrogen atom, the meanings mentioned hereinbefore for R4, and Z5 denotes a nucleophilic leaving group such as a halogen atom or a sulphonyloxy group, for example a chlorine, bromine or iodine atom, the methanesulphonyloxy, p-toluenesulphonyloxy or ethoxysulphonyloxy group, or
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