Azathioprine impurity A - 1-methyl-4-nitro-1H-imidazol-5-amine

Dobutamine impurity mixture

Sulfinpyrazone for system suitability

Nimesulide for peak identification

Econazole

Lisinopril impurity F - (2S)-1-[(2S)-6-amino-2-[[(1S)-1-carboxy-3-cyclohexylpropyl]amino]hexanoyl]pyrrolidine- 2-carboxylic acid (cyclohexyl analogue)

Fosinopril impurity K - (2S,4S)-4-cyclohexyl-1-(2,2-dimethyl-1-oxopropyl) pyrrolidine-2-carboxylic acid

Fosinopril impurity I - [(RS)-[(1SR)-2-methyl-1-(1-oxopropoxy)propoxy](4-phenylbutyl) phosphoryl]acetic acid

Fosinopril impurity D - (2S,4R)-4-cyclohexyl-1-[[(R)-[(1S)-2-methyl- 1-(1-oxopropoxy)propoxy](4-phenylbutyl) phosphoryl]acetyl]pyrrolidine-2-carboxylic acid

Fosinopril impurity C - mixture of (2S,4S)-4-cyclohexyl-1-[[(S)-[(1S)-2-methyl-1-(1-oxopropoxy)propoxy](4-phenylbutyl)phosphoryl]acetyl]pyrrolidine-2-carboxylic acid and (2S,4S)-4-cyclohexyl-1-[[(R)-[(1R)-2-methyl-1-(1-oxopropoxy)propoxy](4-phenylbutyl)phosphoryl]acetyl]pyrrolidine-2-carboxylic acid