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Figure 2
The possible frameworks of hydrogen bonds, designed for barbituric acid and urea co-crystals, consisting of graph sets: (a) R22(8), R32(8), R55(22)

; (b) R22(8), R66(26); (c) R22(8), R32(8); (d) R22(8); (e) R22(8), R45(18); (f) R22(8), R34(12); (g) R22(8), R34(14).

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 64| Part 5| September 2008| Pages 623-632
doi:10.1107/S0108768108026645
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