Table 2. Hydrogen-bond geometry (Å, °) for (I)/(II) .

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1⋯O1i	0.86 (3)	1.99 (3)	2.821 (4)	164 (3)
N2—H2⋯O1	0.88 (3)	1.91 (3)	2.790 (3)	174 (3)

Symmetry code: (i) .