Table 1. Hydrogen-bond geometry (Å, °).
Cg is the centroid of the pyridine ring.
| D—H⋯A | D—H | H⋯A | D⋯A | D—H⋯A |
|---|---|---|---|---|
| N2—H2A⋯O3i | 0.96 (3) | 2.56 (3) | 3.254 (3) | 130 (2) |
| N2—H2A⋯O4i | 0.96 (3) | 1.94 (3) | 2.886 (3) | 169 (3) |
| N2—H2B⋯O1 | 0.90 (3) | 1.98 (3) | 2.821 (4) | 155 (3) |
| N2—H2C⋯O3ii | 0.99 (4) | 1.87 (4) | 2.843 (3) | 167 (3) |
| N3—H3A⋯O2iii | 0.97 (4) | 2.38 (4) | 3.223 (3) | 145 (3) |
| N4—H4A⋯O2 | 0.95 (4) | 1.91 (4) | 2.807 (4) | 158 (3) |
| N4—H4B⋯O4ii | 0.94 (4) | 1.92 (3) | 2.840 (3) | 167 (4) |
| N4—H4C⋯O2iv | 0.91 (4) | 1.98 (4) | 2.823 (4) | 154 (4) |
| N4—H4C⋯N1iv | 0.91 (4) | 2.57 (4) | 3.253 (4) | 133 (3) |
| C8—H8A⋯O1v | 0.97 | 2.49 | 3.218 (4) | 132 |
| C3—H3⋯Cgi | 0.93 | 2.83 | 3.588 (3) | 139 |
| C10—H10B⋯Cgiii | 0.97 | 2.91 | 3.846 (3) | 161 |
Symmetry codes: (i) 
; (ii) 
; (iii) 
; (iv) 
; (v) 
.