structure elucidation problems

50:47

11:27

5:29

7:50

کوتاه

3:59

10:14

4:33

کوتاه

4:08

4:03

2:11

3:56

9:48

20:26

50:52

5:36

1:00:02

16:31

1:07:29

1:15:14

6:32

1:37:07

12:54

کوتاه

56:03

7:27

27:01

3:22

38:41

5:10

2:11:45

36:46

17:46

2:33:50

2:31:23

2:20:28

15:47

53:58