Table 1. Hydrogen-bond geometry (Å, °).
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| C7—H7b⋯N1i | 0.97 | 2.38 | 3.301 (2) | 159 |
| C15—H15b⋯N7ii | 0.97 | 2.62 | 3.504 (2) | 151 |
Symmetry codes: (i) 
; (ii) 
.
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