Table 4. Hydrogen-bond geometry (Å, °) for (3b) .
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| N13—H13⋯O14 | 0.88 | 1.93 | 2.686 (3) | 143 |
| N23—H23⋯O24 | 0.88 | 1.94 | 2.698 (3) | 143 |
| C12—H12⋯O131 | 0.95 | 2.34 | 2.727 (4) | 104 |
| C22—H22⋯O231 | 0.95 | 2.33 | 2.725 (4) | 104 |
| C132—H132⋯O131 | 0.95 | 2.26 | 2.860 (4) | 121 |
| C232—H232⋯O231 | 0.95 | 2.28 | 2.865 (4) | 119 |
| C12—H12⋯O14i | 0.95 | 2.49 | 3.221 (4) | 134 |
| C22—H22⋯O24i | 0.95 | 2.43 | 3.185 (4) | 136 |
| C15—H15⋯O11ii | 0.95 | 2.68 | 3.587 (4) | 160 |
| C25—H25⋯O21ii | 0.95 | 2.58 | 3.530 (4) | 177 |
| C136—H136⋯O131ii | 0.95 | 2.43 | 3.282 (4) | 149 |
| C236—H236⋯O231ii | 0.95 | 2.41 | 3.270 (4) | 151 |
Symmetry codes: (i) 
; (ii) 
.