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Figure 2
A stereoview of part of the crystal structure of (I)[link], showing the formation of a sheet of alternating R22(8) and R66(36) rings parallel to (10[\overline{1}]) formed by two independent N—H⋯N hydrogen bonds. For the sake of clarity, H atoms bonded to C atoms have been omitted. Entirely analogous sheets can be identified in the structures of (II)[link] and (III)[link].

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CHEMISTRY
ISSN: 2053-2296
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