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In (S)-(+)-5-(3-bromo-4-isopropoxyphen-yl)-5-methyl-imidazolidine-2,4-dione, C13H15BrN2O3, (I), the hydantoin groups are connected via inter-molecular N-H⋯O hydrogen bonds, forming a terraced sheet structure. In the chloro analogue, (S)-(+)-5-(3-chloro-4-isopropoxyphen-yl)-5-methyl-imidazolidine-2,4-dione, C13H15ClN2O3, (II), the inter-molecular N-H⋯O hydrogen-bonding network forms a flat sheet. Comparison of the crystal structures reveals that (II) is more loosely packed than (I).

Crystal structures of (S)-(+)-5-(3-bromo/chloro-4-isopropoxyphenyl)-5-methylimidazolidine-2,4-dione