Table 2. Hydrogen-bond geometry (Å, °).

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N12—H2⋯O1	0.88	1.99	2.851 (6)	165
N12—H1⋯O2ii	0.88	2.07	2.889 (6)	155
N22—H3⋯O1	0.88	2.12	2.959 (7)	158
N22—H4⋯O1iii	0.88	2.11	2.955 (6)	162

Symmetry codes: (ii) ; (iii) .