Position

Unknown impurity

DABE

δ H

δ H

1

0.87 (3H, t)

0.87 (3H, t)

2

1.09 (3H, t)

1.09 (3H, t)

3

1.32 (6H, m)

1.34 (6H, m)

4

1.60 (2H, m)

1.65 (2H, m)

5

2.68 (2H, t)

2.68 (2H, t)

6

3.76 (3H, s)

3.78 (3H, s)

7

3.95 (2H, m)

3.98 (2H, m)

8

4.08 (2H, t)

4.22 (4H, m)

9

4.22 (2H, t)

10

4.60 (2H, d)

4.69 (2H, d)

11

6.73 (2H, d)

6.85 - 7.66 (11H, m)

12

6.87-7.16 (4H, m)

13

7.39-7.80 (5H, m)

14-NH

8.38 (1H, d)

8.39 (1H, d)

15-NH

10.45 (1H, s)

10.02 (1H, s)

16-NH2

-

10.64 - 11.88 (2H, broad singlets)