| http://www.w3.org/ns/prov#value | - R1 to R3 and X are as hereinbefore defined and Z1 denotes a leaving group such as a halogen atom, a substituted hydroxy, mercapto, sulphinyl, sulphonyl or sulphonyloxy group such as a chlorine or bromine atom, a methanesulphonyl or methanesulphonyloxy group, with R4???H or salts thereof, where R4 is as hereinbefore defined.
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