| http://www.w3.org/ns/prov#value | - derivative of the Formula I wherein R.sup.1 or a substituent on Q is hydroxy, mercapto or amino as appropriate.The reaction is preferably carried out in the presence of a suitable inert solvent or diluent, for example a halogenated solvent such as methylene chloride, chloroform or carbon tetrachloride, an ether such as tetrah
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