The molecular structures of p-nitro and p-chlorobenzyl derivatives of barbital were established as 5, 5-diethyl-1, 3-bis (p-nitrobenzyl) barbituric acid (1) and 1, 3-bis (p-chlorobenzyl)-5, 5-diethylbarbituric acid (2) by means of the X-ray crystallographic analysis. Both crystals belong to a monoclinic system with a space group P2 1/n. The cell constants for 0.099 for 1802 reflections, and that of 2 to be R=0.088 for 2969 reflections.
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