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Figure 4
The three fundamental connection modes for the formation of N—H⋯O=C bonds in 1-substituted derivatives of barbituric acid arising from the involvement of different carbonyl groups, and the corresponding numbers of observed dimer and catemer isomers. The (SbRh) form of methohexithal contains a dimer with mixed N—H⋯O=C2/N—H⋯O=C4 connectivity and was therefore not included.

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
Volume 71| Part 2| January 2015| Pages 206-209
doi:10.1107/S205698901500105X
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