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Figure 4
The hydrogen bonds leading to 20-membered rings. a: O1-H1
O2, b: N1-H71
Br1, d: O2-H2
Br1.
![[Figure 4]](ng2630fig4mag.jpg)
O2, b: N1-H71Br1, d: O2-H2Br1. ![[article HTML]](../../../../../graphics/viewarticleborder.gif)
O2, b: N1-H71Br1, d: O2-H2Br1.
![[Figure 4]](ng2630fig4.jpg)