| http://www.w3.org/ns/prov#value | - In the Scheme below R20 represents an ester or nitrile and LG represents a leaving group such as a halogen atom, e.g. chlorine or bromine, or a sulfonyloxy group such as an alkylsulfonyloxy group, e.g. trifluoromethylsulfonyloxy, or an arylsulfonyloxy group, e.g. p-toluenesulfonyloxy.
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