Standard for Torasemide Impurity;Torasemide Impurity 2(Torasemide EP Impurity B);Torasemide EP Impurity B;Torasemide impurity B (EP);4-[(3-Methylphenyl)amino]-pyridin-3-sulfonamide;4-(-3-METHYLPHENYL)AMINO-3-PYRIDINESULFONAMIDE;4-(3'-METHYLPHENYL)AMINO-3-PYRIDINESULFONAMIDE;3-SULFONAMIDO-4-(3-METHYLANILINO)-PYRIDINE