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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1⋯O1	0.78 (4)	1.88 (4)	2.569 (5)	148 (4)
O2—H2⋯O1	0.82	2.34	2.768 (5)	113
O2—H2⋯N3i	0.82	2.16	2.862 (5)	144
N2—H2A⋯O1ii	0.86	1.94	2.790 (4)	172
C18—H18A⋯O4iii	0.96	2.52	3.469 (5)	171

Symmetry codes: (i) ; (ii) ; (iii) .