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Figure 5
Illustrations for the crystal structure of 3a: (a) packing diagram; (b) one-dimensional chain via N—H⋯N hydrogen bonds; (c) off-set packing of 3a; (d) stacking of 3a for single [2 + 2] reaction.

IUCrJ
Volume 2| Part 5| September 2015| Pages 523-533
ISSN: 2052-2525