S. No

Peak label

Retention time

Area%

Observed mass

About the peak

1

Peak-1

6.93

7.37

271.98 (M + H)

Reported impurity

2

Peak-2

9.25

37.35

370.05 (M + H)

Lansoprazole

3

Peak-3

10.38

8.8

354.03 (M + H)

Sulphide impurity

4

Peak-4

11.27

9.9

Mixture of masses 407.13 (M + H), 502.10 (M + H)

Unresolved unknown impurities

5

Peak-5

12.63

16.86

468.11 (M + H)

Well resolved unknown impurity