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

Cg is the centroid of the C1–C6 ring

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O4—H4O⋯O1Si	0.86 (2)	2.57 (4)	3.058 (3)	117 (4)
O4—H4O⋯N3	0.86 (2)	1.93 (3)	2.670 (2)	143 (4)
N2—H2N⋯O1S	0.86 (2)	2.01 (2)	2.855 (3)	166 (3)
O1S—H2S⋯O4ii	0.87 (2)	2.01 (2)	2.860 (3)	165 (4)
O1S—H1S⋯O3iii	0.88 (2)	1.80 (2)	2.676 (3)	175 (5)
C14—H14⋯O1S	0.93	2.37	3.184 (2)	146
C21—H21⋯O1S	0.93	2.43	3.325 (3)	161
C7—H7B⋯Cgiv	0.97	2.69	3.472 (2)	138

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