英文别名Ibutilide Impurity 1; 4-[4-(methanesulfonamido)phenyl]-4-oxobutanoic acid; 4-[(4-Mesylamino)phenyl]-4-oxobutyric acid; Ibutilide Impurity 4; 4-(METHYLSULFONYL)AMINO-γ-OXO-BENZENEBUTANOIC ACID; 4-[(Methylsulfonyl)amino]-gamma-oxo-benzenebutanoic acid; 4-(4-methylsulfonylaminophenyl)-4-oxobutyric acid; 4-[(methylsulfonyl)amino]gamma-oxobenzenebutanoic acid; Benzenebutanoic acid, 4-[(methylsulfonyl)amino]-gamma-oxo- 
