| http://www.w3.org/ns/prov#value | - (where Lv is a displaceable leaving group, for example a halogen atom or a substituted sulphonyloxy group, such as chlorine, bromine, iodine, methanesulphonyloxy, phenysulphonyloxy or p-toluenesulphonyloxy groups) and R4 is a group CR1 2 Y or group R1 other than hydrogen);
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