Table 4. Hydrogen-bond geometry (Å, °) for (IV) .
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| O1—H1⋯N2 | 0.84 (7) | 1.70 (6) | 2.514 (2) | 163 (7) |
| N2—H2⋯O1 | 0.87 (4) | 1.67 (5) | 2.514 (2) | 162 (4) |
| C10—H10⋯O2i | 0.95 | 2.54 | 3.364 (3) | 145 |
Symmetry code: (i) 
.
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