The selection of the receptor presenting the strongest affinity for a barbiturate substrate from a dynamic combinatorial library of constituents differing in structure and conformation/configuration is described. The gradual addition of the barbiturate to an equilibrating mixture of hydrazone isomers leads to the quantitative shift towards a single species, 3, which presents highest complementarity to the substrate and yields the supramolecular entity 3:4.
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Berl et al. (1999) studied this question.
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