(2S)-2-[(4-METHYLAMINOBENZOYL)AMINO]PENTANEDIOIC ACID;Methotrexate EP Impurity L (N-(4-Methylaminobenzoyl)-L-Glutamic Acid);Methotrexate EP Impurity L(Amethopterin EP Impurity L);2-[[4-(methylamino)benzoyl]amino]pentanedioic acid;N-(4-(METHYLAMINO)BENZOYL)-L-GLUTAMIC ACID;Methotrexate EP Impurity L;Methotrexate Impurity 12(EP-L);Methotrexate Impurity L