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Figure 3
Part of the crystal structure of polymorph (Ia)[link], showing the one-dimensional ribbons formed by the R22(8) dimer. Further adjacent screw-related ribbons are inter­connected through N—H⋯O hydrogen bonds, thereby forming a hexa­meric hydrogen-bonded cavity with an R66(30) motif. Hydrogen bonds are shown as dashed lines and H atoms not involved in hydrogen bonding have been omitted for clarity.

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296
Volume 71| Part 2| January 2015| Pages 128-135
doi:10.1107/S2053229615000492
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