Table 3. Hydrogen-bond geometry (Å, °) for (3a) .

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N3—H3⋯O4	0.95 (2)	1.89 (2)	2.7147 (17)	143.8 (18)
C312—H312⋯O3	0.95	2.25	2.855 (2)	121
C2—H2⋯O3i	0.95	2.37	3.243 (2)	153

Symmetry code: (i) .