Phentolamine mesilate for system suitability

Entacapone impurity A - Z isomer of entacapone

Entacapone

Tropicamide impurity C - (2RS)-3-hydroxy-2-phenylpropanoic acid (tropic acid)

Azathioprine impurity G - 6-[(1-methyl-4-nitro-1H-imidazol-5-yl)sulfanyl]-7H-purin-2-amine (thiamiprine)

Amylmetacresol for peak identification

Amylmetacresol

Folic acid impurity D - 4-[[(2-amino-4-oxo-1,4-dihydropteridin-6-yl)methyl]amino]benzoic acid (pteroic acid)

Folic acid impurity A - (2S)-2-[(4-aminobenzoyl)amino]pentanedioic acid (N-(4-aminobenzoyl)-l-glutamic acid)

Ziprasidone for system suitability 2