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The synthesis of new derivatives of 2'-hydroxychalcone, such as esters, sulfonates, and thiocarbamates, prepared for evaluation as antiparasitic agents as well as new heterocyclic chalcone analogues prepared for the same purpose, is described.

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The identification of barbituric acids by the x-ray powder diffraction method is discussed from the practical point of view. Data are presented showing the advantage of preparing the p-nitrobenzyl derivative whenever identification of the isolated free acid is either doubtful or considered impossible. A detailed account of the experimental micro technique is given and the applicability of the technique to pharmaceutical products as forensic specimens is discussed.