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

Terazosin impurity E - 2,2`-(piperazine-1,4-diyl)bis(6,7-dimethoxyquinazolin-4-amine)

Ribonucleic acid

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)

Febantel for system suitability

Verbenalin

Iotrolan for system suitability

Pyrrolidone

Spectinomycin sulphate tetrahydrate

Yohimbine hydrochloride