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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O3—H1O3⋯O2i	0.85 (3)	2.01 (3)	2.8504 (17)	169 (3)
O4—H1O4⋯O1ii	0.84 (3)	1.89 (3)	2.7089 (16)	165 (3)
C18—H18B⋯O3iii	0.96	2.55	3.407 (2)	149

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