Table 1. Hydrogen-bond geometry (Å, °).
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| N9—H9⋯O17i | 0.87 (2) | 2.18 (2) | 3.029 (2) | 165.8 (17) |
| O16—H16⋯O8ii | 0.88 (4) | 1.84 (4) | 2.710 (2) | 172 (3) |
Symmetry codes: (i) 
; (ii) 
.
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