Table 2. Hydrogen bonds in the basic structure.

The acceptor molecules are related to the donor molecule by the given symmetry operations. Since the positions of the H atoms were not refined, no esds are given.

D—H⋯A	Acceptor symmetry	Occ.	D⋯H (Å)	H⋯A (Å)	D⋯A (Å)	D—H⋯A (°)
Inside I half-layer
O3—H⋯O5	t(½, −½, 0)	½	0.88	1.86	2.7316 (11)	169
O3—H⋯O6	t(0,−1,0)	½	0.84	2.12	2.9274 (9)	163
O4—H⋯O6	t(0, −1, 0)	½	0.88	2.04	2.9029 (10)	171
O5—H⋯O3	t(−½, ½, 0)	½	0.86	2.08	2.7316 (11)	132
O6—H⋯O2	t(−½, ½, 0)	1	0.87	2.20	3.0030 (10)	154
Across I half-layers
O4—H⋯O4	2 0, y, ½	½	0.85	1.98	2.8111 (11)	165
O5—H⋯O5	2 0, y, ½	½	0.86	1.82	2.6816 (11)	175