Table 2. Hydrogen-bond geometry (Å, °) for 1 .

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O13—H13⋯N12i	0.84	1.93	2.764 (2)	170
C3—H3⋯O13ii	0.95	2.50	3.442 (2)	174
C21—H21C⋯O13iii	0.98	2.57	3.506 (3)	160

Symmetry codes: (i) ; (ii) ; (iii) .