| http://www.w3.org/ns/prov#value | - group of one of the abovementioned groups which can be cleaved in vivo and Z.sub.5 denotes a nucleofugic leaving group such as a halogen atom, e.g. a chlorine, bromine or iodine atom, or a p-nitrophenyl group.The reaction is preferably carried out in a solvent such as methanol, ethanol, methylene chloride, tetrahydrofuran, toluene, dioxane, dimethylsulphoxide or dimethylformamide optionally in the
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