英文别名Pemetrexed Impurity 12; 4-(3-bromo-4-oxobutyl)Benzoic acid methyl ester; Pemetrexed disodium intermediate T3; Benzoic acid, 4-(3-bromo-4-oxobutyl)-, methyl ester; METHYL 4-(3-BROMO-4-OXOBUTYL)BENZOATE; 2-bromo-4-(4-carbomethoxyphenyl)butanal; methyl 4-(3-bromo-4-oxo-butyl)benzoate; 2-bromo-4-(4-carbomethoxyphenyl) butanal 
