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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N51—H51A⋯N3i	0.85 (2)	2.29 (2)	3.130 (2)	169.2 (18)
N51—H51B⋯O51ii	0.87 (2)	2.03 (2)	2.8938 (19)	171.3 (18)

Symmetry codes: (i) ; (ii) .