Table 1. Centroid-to-centroid distances (Å).
| Cg1⋯Cg3i | 3.780 (4) |
| Cg2⋯Cg3ii | 3.775 (4) |
Symmetry codes: (i) 
; (ii) 
. Cg1, Cg2 and Cg3 are the centroids of the N1/C13/C12/C9/C10/C14, C5–C10 and C15/C19–C22/C16 rings, respectively.
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