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Figure 20
Layers in polymorphs (a) I and (b) II of oxBSEM (1b) viewed approximately along the main axis of the molecules. Color codes as in Fig. 7[link]. H atoms have been omitted for clarity. C—H⋯O and C—H⋯C contacts are indicated by arrows originating from the `donor' C atoms, C—H⋯H—C contacts by double-sided arrows connecting the C atoms.

IUCrJ
Volume 2| Part 5| September 2015| Pages 584-600
ISSN: 2052-2525
https://doi.org/10.1107/S2052252515011665