Methadone hydrochloride - Reference Spectrum

Methanol - Reference Spectrum

Methenamine

Methionine

Methotrexate

Methotrexate for peak identification

Methotrexate for system suitability

Methotrexate impurity C - (2S)-2-[[4-[[(2-amino-4-oxo-1,4-dihydropteridin-6-yl)methyl]methylamino]benzoyl]amino]pentanedioic acid (N-methylfolic acid, methopteridine)

Methotrexate impurity D - 4-[[(2-amino-4hydroxypteridin-6-yl)methyl]methyl-amino]benzoic acid

Methotrexate impurity E - 4-[[(2,4-diaminopteridin-6-yl)methyl]methylamino]benzoic acid (4-amino-N10-methylpteroic acid, APA)