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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H3A⋯O1	0.86	1.92	2.765 (2)	167
N1—H3B⋯O2i	0.86	1.99	2.821 (2)	162
N2—H1⋯O2	0.92 (3)	1.78 (3)	2.6989 (19)	178 (2)
C3—H1C⋯O1ii	0.97	2.65	3.479 (2)	143

Symmetry codes: (i) ; (ii) .