Table 1. Hydrogen-bond geometry (Å, °).
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| N12—H12⋯O23i | 0.87 | 2.08 | 2.9403 (18) | 168 |
| C4—H4⋯O23i | 0.95 | 2.57 | 3.3000 (19) | 134 |
| C20—H20B⋯O21ii | 0.98 | 2.56 | 3.496 (3) | 160 |
Symmetry codes: (i) 
; (ii) 
.
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