英文别名(S)-5-(tert-butoxy)-4-(4-(((2,4-diaminopteridin-6-yl)methyl)(methyl)amino)benzamido)-5-oxopentanoic acid; L-Glutamic acid, N-[4-[[(2,4-diamino-6-pteridinyl)methyl]methylamino]benzoyl]-, 1-(1,1-dimethylethyl) ester; Methotrexate a-tert-Butyl Ester; Methotrexate Impurity 8; α-OtBu-MTX; (S)-2-{4-[(2,4-Diamino-pteridin-6-ylmethyl)-methyl-amino]-benzoylamino}-pentanedioic acid 1-tert-butyl ester; methotrexate-α-tert-butylester; methotrexate-α-OtBu; α-tert-butyl-N-[4-[[(2,4-diamino-6-pteridinyl)methyl]methylamino]benzoyl]-L-glutamate; MTX-α-OtBu 
