API
IMPURITY
CHEMICAL NAME
STRUCTURE
2
Metamizole

EP Impurity B

4-amino-1,2-dihydro-2,3-dimethyl-1-phenylpyrazol-5-one Metamizole-EP-Impurity-B
Metamizole

EP Impurity A

N-(2,5-dihydro-2,3-dimethyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)formamide Metamizole-EP-Impurity-A
Metamizole

EP Impurity C

1,2-dihydro-2,3-dimethyl-4-(methylamino)-1-phenylpyrazol-5-one Metamizole-EP-Impurity-C
Metamizole

EP Impurity D

4-(dimethylamino)-1,2-dihydro-2,3-dimethyl-1-phenylpyrazol-5-one Metamizole-EP-Impurity-D
Metformin

EP Impurity C

N,N-dimethyl-1,3,5-triazine-2,4,6-triamine Metformin-EP-Impurity-C