Tirofiban Impurity 13 4-(4-pyridinyl)butyl chloride hydrochloride Tirofiban Impurity 21 Tirofiban Impurity 16 1-Butanesulfonic acid, butyl ester N-Butylsulfonyl-O-(4-(4-pyridinyl)butyl)-L-tyrosine Tirofiban Impurity 6 1-Butanesulfonic acid methyl ester 4-PYRIDIN-4-YL-BUTYRIC ACID Tirofiban Impurity 12 Tirofiban Impurity 20 Tirofiban Impurity 15 L-N-BUTYLSULFONYL-P-HYDROXYPHENYLALANINE Tirofiban Impurity 5 R-Tirofiban HCl 4-BUTYLPIPERIDINE Tirofiban Impurity 9 Tirofiban Impurity 11