Preliminary experiments demonstrate that the results of dynamic combinatorial chem. (DCC) processes can be deconvoluted using X-ray crystallog.The examples reported involve adduct formation between serine proteases, boric acid and a mixture of as many as eleven alcs.Several DCC experiments are described and in each case X-ray crystallog. provides a useful tool for product identification.These results demonstrate the assembly, selection and identification of products that form the basis of an exptl. de novo drug design protocol.