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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1⋯N3	0.82	1.87	2.677 (3)	167
N1—H1A⋯O3i	0.89	1.85	2.716 (3)	164
N1—H1B⋯N2ii	0.89	2.13	2.920 (3)	148
N1—H1C⋯O4iii	0.89	1.87	2.732 (3)	163

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