| http://www.w3.org/ns/prov#value | - G is a leaving group, preferably, a nitro group or a halogen such as fluorine or bromine or chlorine, or G is a vinyl group, or a haloalkyl group such as a chloromethyl or bromomethyl group, or a vinyl sulfone group, each R1 is an electron withdrawing group independently selected from fluorine, trifluoromethyl, nitro, and functional equivalents thereof;
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