Table 5. Analysis of COSY-NMR correlations.

Position	Protons
3	H-4
4	H-3
8	H-9
9	H-8
11	H-12
12	H-11, H-13
13	H-12, H-14
14	H-13, H-15
15	H-14
17	H-18
18	H-17
20	H-21
21	H-20, H-22
22	H-21