Comp.no.

Chemical analysis Calc/found

C, %

H, %

N, %

O, %

I

58.73/58.78

3.86/3.89

10.82/10.82

8.24/8.24

II

62.53/62.53

4.22/4.25

17.38/17.36

15.88/15.86

III

74.32/74.39

6.45/6.50

10.84/10.84

8.26/8.26