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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1A—H1C⋯O1A i	0.860 (18)	2.179 (18)	2.9571 (14)	150.4 (15)
N1B—H1D⋯O1B i	0.84 (2)	2.21 (2)	2.9784 (14)	151.4 (17)

Symmetry code: (i) .