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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
C2—H2C⋯O2i	0.97	2.56	3.284 (3)	132
C4—H4B⋯O2ii	0.97	2.50	3.431 (3)	162

Symmetry codes: (i) ; (ii) .