2,4-DIAMINOPTERIDIN-6-YL;Methotrexate EP Impurity A HCl;(2,4-diamino-7H-pteridin-8-yl)methanol;2,4-Diamino-6-(Hydroxymethyl)pteridine HCl;4-DiaMino-6-pteridineMethanol Hydrochloride;Methotrexate EP Impurity A as Hydrochloride;(2,4-DIAMINOPTERIDIN-6-YL)METHANOL HYDROCHLORIDE H;2,4-Diamino-6-pteridinemethanol Hydrochloride Salt;2,4-diamino-6-(hydroxymethyl)pteridine hydrocloride;2,4-Diamino-8-(hydroxymethyl)pteridinehydrochloride