| http://www.w3.org/ns/prov#value | - and R12 is a leaving group or an electrophilic functional group attached with a leaving group or --Q--R--Nu, --Q--R(I)n Nu, --Q--Nu, --R--Nu or --Nu, n is a number of at least 1, Nu is a nucleophilic group, Q is a functional linkage, I is an ionic or ionizable group;
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