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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N13—H13A⋯O16i	0.88	2.13	2.971 (2)	160
N13—H13B⋯O32ii	0.88	2.49	2.896 (3)	109
O16—H16A⋯O32iii	0.84	1.91	2.631 (2)	143
N33—H33B⋯O12	0.88	2.29	2.861 (3)	123
N33—H33A⋯O36i	0.88	2.53	3.281 (3)	143
O36—H36A⋯O12iv	0.84	1.91	2.727 (2)	165

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