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Figure 5
(a) Simplified representation of a mol­ecule of a 5,5-disubstituted derivative of barbituric acid. The same scheme can be applied for analogous thio­barbiturates such as (I)[link] and (II)[link] if the O atom of the carbonyl group in position 2 is replaced by a thioxo S atom. (b) and (c) Schematic representation of the N—H⋯O=C-bonded chain types C-1 and C-2 with an underlying 2C1 topology, which are frequently found in barbiturates. The thio­barbiturates (I)[link] and (II)[link] contain chains of the C-2 type.

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
Volume 73| Part 12| December 2017| Pages 1908-1912
https://doi.org/10.1107/S205698901701653X
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