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Metamizole EP Impurity B

Synonym

4-amino-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one

Molecular Formula

C11H13N3O

Molecular Weight

203.25

Catalogue Number

AR-A12685

Parent Drug

Metamizole

CAS Number

83-07-8
Metamizole EP Impurity D

Synonym

4-(dimethylamino)-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one

Molecular Formula

C13H17N3O

Molecular Weight

231.3

Catalogue Number

AR-A12688

Parent Drug

Metamizole

CAS Number

58-15-1
Metamizole EP Impurity A

Synonym

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

Molecular Formula

C12H13N3O2

Molecular Weight

231.26

Catalogue Number

AR-A12692

Parent Drug

Metamizole

CAS Number

1672-58-8
Metamizol EP Impurity C (free base)

Synonym

1,5-dimethyl-4-(methylamino)-2-phenyl-1H-pyrazol-3(2H)-one

Molecular Formula

C12H15N3O

Molecular Weight

217.27

Catalogue Number

AR-A12697

Parent Drug

Metamizole

CAS Number

519-98-2
Metamizole Impurity 2

Synonym

Metamizole Impurity (methyl(5-methyl-3-oxo-2-phenyl-1-(sulfomethyl)-2,3-dihydro-1H-pyrazol-4-yl)amino)methanesulfonic acid

Molecular Formula

C13H17N3O7S2

Molecular Weight

391.41

Catalogue Number

AR-M00987

Parent Drug

Metamizole
Metamizole EP Impurity C (HCl salt)

Synonym

1,5-dimethyl-4-(methylamino)-2-phenyl-1H-pyrazol-3(2H)-one hydrochloride

Molecular Formula

C12H15N3O. HCl

Molecular Weight

217.27 36.46

Catalogue Number

AR-M00990

Parent Drug

Metamizole

CAS Number

856307-27-2 (freebase)
Metamizole Sodium Monohydrate

Synonym

[(2,3-dihydro-1,5-dimethyl-3-oxo-2-phenyl-1H-pyrazol-4-yl)methylamino methanesulfonicacid, , sodium salt, monohydrate; sodium ((1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)(methyl)amino)methanesulfonate hydrate

Molecular Formula

C13H16N3O4S; Na; H2O

Molecular Weight

311.36; 22.98; 18.01

Catalogue Number

AR-M00992

Parent Drug

Metamizole

CAS Number

5907-38-0 (sodium salt); alt. cas#: 50567-35-6 (free base)
Metamizole EP Impurity C

Synonym

1,5-dimethyl-4-(methylamino)-2-phenyl-1H-pyrazol-3(2H)-one hydrochloride

Molecular Formula

C12H15N3O. HCl

Molecular Weight

217.27 36.46

Catalogue Number

AR-M00994

Parent Drug

Metamizole

CAS Number

856307-27-2
Metamizole EP Impurity A

Synonym

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

Molecular Formula

C12H13N3O2

Molecular Weight

231.25

Catalogue Number

AR-M00995

Parent Drug

Metamizole

CAS Number

1672-58-2
Metamizole Sodium Impurity E

Synonym

sodium ((1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)amino)methanesulfonate

Molecular Formula

C12H14N3NaO4S

Molecular Weight

319.31

Catalogue Number

AR-M00998

Parent Drug

Metamizole

CAS Number

129-89-5