英文别名Pemetrexed Impurity 12; 4-[2-(2-amino-4,6-dioxo-4,5,6,7-tetrahydro-3H-pyrrolo[2,3-d]pyrimidin-5-yl)-ethyl]-benzoic acid; PeMetrexed acid oxo iMpurity; 4-(2-{2-amino-4,6-dioxo-3H,4H,5H,6H,7H-pyrrolo[2,3-d]pyrimidin-5-yl}ethyl)benzoic acid; Pemetrexed acid oxo impurities; Benzoic acid, 4-[2-(2-amino-4,5,6,7-tetrahydro-4,6-dioxo-3H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]-; Pemetrexed Impurity 59; 4-[2-(2-amino-4,6-dioxo-5,7-dihydro-3H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzoic acid 
