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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H2A⋯O1ii	0.92 (2)	1.87 (2)	2.791 (3)	178.8 (18)
N4—H4A⋯O2ii	0.920 (18)	1.897 (19)	2.808 (3)	170.3 (19)
O5—H1W⋯O1iii	0.82 (2)	1.93 (2)	2.739 (3)	169 (2)
O5—H2W⋯O4i	0.81 (2)	1.88 (2)	2.673 (3)	163 (2)
O3—H3⋯O2	0.82	1.62	2.432 (3)	172

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