英文别名Methotrexate Impurity 21; 2,4-Pteridinediamine, 6-(chloromethyl)-, hydrochloride (1:1); 6-(Chloromethyl)-2,4-pteridinediamine hydrochloride (1:1); 6-(Chloromethyl)pteridine-2,4-diamine hydrochloride (1:1); 2,4-Diamino-6-(chloromethyl)pteridine Hydrochloride; 6-(chloromethyl)pteridine-2,4-diamine monohydrochloride; 6-(Chloromethyl)-2,4-pteridinediamine monohydrochloride; 6-(chloromethyl)pteridine-2,4-diamine, hydrochloride; 6-(Chloromethyl)pteridine-2,4-diamine; Folic Acid Impurity 42 
