| http://www.w3.org/ns/prov#value | - However, there is a point where the heterocycle becomes basic enough to produce salts, which often leads tounpredictable connectivity and stoichiometry.Once the effectiveness of the N-heterocyclic amides as supramolecular reagents wasestablished, a series of more closely-related ditopic hydrogen-bond acceptor molecules were synthesized.
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