API
IMPURITY
CHEMICAL NAME
STRUCTURE
2
Omeprazole

EP Impurity A

5-methoxy-1H-benzimidazole-2-thiol Omeprazole-EP-Impurity-A
Omeprazole

EP Impurity D

5-methoxy-2-[[(4-methoxy-3,5-dimethylpyridin-2-yl)methyl]sulphonyl]-1H-benzimidazole (omeprazole sulphone), Omeprazole-EP-Impurity-D
Omeprazole

EP Impurity E

5-Methoxy-2-[[(4-methoxy-3,5-dimethylpyridine-2-yl)methyl]sulfinyl]-1H-benzimidazole 1'-oxide Omeprazole-EP-Impurity-E
Omeprazole

EP Impurity C

5-methoxy-2-[[(4-methoxy-3,5-dimethylpyridin-2-yl)methyl]sulphanyl]-1H-benzimidazole (ufiprazole) Omeprazole-EP-Impurity-C
Omeprazole

EP Impurity I

4-methoxy-2-[[(5-methoxy-1H-benzimidazol-2-yl)sulphonyl]methyl]-3,5- dimethylpyridine 1-oxide Omeprazole-EP-Impurity-I
Omeprazole

5-methoxy 1-h benzimidazole-2-thiol

5-METHOXY-1H-BENZIMIDAZOL-2-THIOL 6