Table 1. Hydrogen-bond geometry (Å, °).

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N⋯O1i	0.90	2.07	2.956 (2)	168
N3—H3N⋯O2ii	0.77	2.23	2.998 (2)	172
C6—H6⋯O2i	0.93	2.52	3.381 (2)	155

Symmetry codes: (i) ; (ii) .