levofloxacin and its Impurities
A broad-spectrum antibiotic, which shows its action against both gram-positive and gram-negative strains. Levofloxacin is a bactericidal antibiotic and used in treating several infections. It is a levo isomer of the racemate ofloxacin. Reference standards of Levofloxacin API,and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.


(3S)-10-(4-Ethyl-1-piperazinyl)-9-fluoro-2,3-dihydro-3-methyl-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic Acid
(3S)-10-(4-Ethyl-1-piperazinyl)-9-fluoro-2,3-dihydro-3-methyl-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic Acid
Catalogue No.:PA 12 13580
CAS :
106939-30-4
Molecular Formula : C19H22FN3O4
Molecular Weight : 375.39


(3S)-9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic Acid Ethyl Ester
(3S)-9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic Acid Ethyl Ester
Catalogue No.:PA 12 13600
CAS :
106939-34-8
Molecular Formula : C15H13F2NO4
Molecular Weight : 309.26


Potassium (S)-9-fluoro-3-methyl-10-(4-methylpiperazin-1-yl)-7-oxo-3,7-dihydro-2H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylate
Potassium (S)-9-fluoro-3-methyl-10-(4-methylpiperazin-1-yl)-7-oxo-3,7-dihydro-2H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylate
Catalogue No.:PAI 12 003010
CAS :
NA
Molecular Formula : C18H19FKN3O4
Molecular Weight : 399.50


9-fluoro-10-(4-(2-hydroxyethyl)-4-methylpiperazin-1-ium-1-yl)-3-methyl-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylate
9-fluoro-10-(4-(2-hydroxyethyl)-4-methylpiperazin-1-ium-1-yl)-3-methyl-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylate
Catalogue No.:PA 12 13660
CAS :
NA
Molecular Formula : C20H24FN3O5
Molecular Weight : 405.43


(3R)-9-Fluoro-2,3-dihydro-3-methyl-10-(4-methyl-4-oxido-1-Piperazinyl)-7-oxo-7H-pyrido[1,2,3-de]-1,4-Benzoxazine-6-Varboxylic Acid
(3R)-9-Fluoro-2,3-dihydro-3-methyl-10-(4-methyl-4-oxido-1-Piperazinyl)-7-oxo-7H-pyrido[1,2,3-de]-1,4-Benzoxazine-6-Varboxylic Acid
Catalogue No.:PA 12 13680
CAS :
117678-37-2
Molecular Formula : C18H20FN3O5
Molecular Weight : 377.37


(3S)-9,10-difluoro-3-methyl-7-oxo-2,3,6,7-tetrahydro-5H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic Acid
(3S)-9,10-difluoro-3-methyl-7-oxo-2,3,6,7-tetrahydro-5H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic Acid
Catalogue No.:PA 12 13690
CAS :
1026952-91-9
Molecular Formula : C13H11F2NO4
Molecular Weight : 283.23


(3S)-10-Fluoro-2,3-dihydro-3-methyl-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid
(3S)-10-Fluoro-2,3-dihydro-3-methyl-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid
Catalogue No.:PA 12 0131002
CAS :
117620-84-5
Molecular Formula : C13H10FNO4
Molecular Weight : 263.22


2,3,4,5-Tetrafluoro-α-[[[(1S)-2-hydroxy-1-methylethyl]amino]methylene]-β-oxo-benzenepropanoic Acid Ethyl Ester
2,3,4,5-Tetrafluoro-α-[[[(1S)-2-hydroxy-1-methylethyl]amino]methylene]-β-oxo-benzenepropanoic Acid Ethyl Ester
Catalogue No.:PA 12 0131003
CAS :
110548-02-2
Molecular Formula : C15H15F4NO4
Molecular Weight : 349.28


Ethyl (S)-8-amino-10-fluoro-3-methyl-9-(4-methylpiperazin-1-yl)-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylate
Ethyl (S)-8-amino-10-fluoro-3-methyl-9-(4-methylpiperazin-1-yl)-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylate
Catalogue No.:PAI 12 003011
CAS :
2130840-90-1
Molecular Formula : C20H25FN4O4
Molecular Weight : 404.44


Ethyl (S)-10-fluoro-3-methyl-9-(4-methylpiperazin-1-yl)-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylate
Ethyl (S)-10-fluoro-3-methyl-9-(4-methylpiperazin-1-yl)-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylate
Catalogue No.:PAI 12 003012
CAS :
2130840-92-3
Molecular Formula : C20H24FN3O4
Molecular Weight : 389.43


Ethyl (3S)-9,10-difluoro-2,3-dihydro-3-methyl-8-nitro-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylate
Ethyl (3S)-9,10-difluoro-2,3-dihydro-3-methyl-8-nitro-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylate
Catalogue No.:PAI 12 003013
CAS :
1012310-27-8
Molecular Formula : C15H12F2N2O6
Molecular Weight : 354.27


Ethyl (S)-10-fluoro-3-methyl-9-(4-methylpiperazin-1-yl)-8-nitro-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylate
Ethyl (S)-10-fluoro-3-methyl-9-(4-methylpiperazin-1-yl)-8-nitro-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylate
Catalogue No.:PAI 12 003014
CAS :
2130840-88-7
Molecular Formula : C20H23FN4O6
Molecular Weight : 434.42


(S)-3-Methyl-10-(4-methylpiperazin-1-yl)-9-(methylthio)-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic Acid
(S)-3-Methyl-10-(4-methylpiperazin-1-yl)-9-(methylthio)-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic Acid
Catalogue No.:PAI 12 003015
CAS :
2574301-93-0
Molecular Formula : C19H23N3O4S
Molecular Weight : 389.47


(S)-9-Fluoro-3-methyl-10-(4-nitrosopiperazin-1-yl)-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic Acid
(S)-9-Fluoro-3-methyl-10-(4-nitrosopiperazin-1-yl)-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic Acid
Catalogue No.:PA 12 0131005
CAS :
1152314-62-9
Molecular Formula : C17H17FN4O5
Molecular Weight : 376.34


(S)-10-((2-Aminoethyl)(nitroso)amino)-9-fluoro-3-methyl-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic acid Hydrochloride
(S)-10-((2-Aminoethyl)(nitroso)amino)-9-fluoro-3-methyl-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic acid Hydrochloride
Catalogue No.:PA 12 0131006
CAS :
NA
Molecular Formula : C15H16ClFN4O5
Molecular Weight : 386.76


Ethyl (S)-8-bromo-10-fluoro-3-methyl-9-(4-methylpiperazin-1-yl)-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylate
Ethyl (S)-8-bromo-10-fluoro-3-methyl-9-(4-methylpiperazin-1-yl)-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylate
Catalogue No.:PAI 12 003016
CAS :
NA
Molecular Formula : C20H23BrFN3O4
Molecular Weight : 468.32


(R)-9-Fluoro-3-methyl-7-oxo-10-(piperazin-1-yl)-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic Acid
(R)-9-Fluoro-3-methyl-7-oxo-10-(piperazin-1-yl)-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic Acid
Catalogue No.:PA 12 0131007
CAS :
117707-39-8
Molecular Formula : C17H18FN3O4
Molecular Weight : 347.35


(S)-9-Fluoro-3-methyl-10-((2-(methyl(nitroso)amino)ethyl)(nitroso)amino)-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic Acid
(S)-9-Fluoro-3-methyl-10-((2-(methyl(nitroso)amino)ethyl)(nitroso)amino)-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic Acid
Catalogue No.:PA 12 0131008
CAS :
NA
Molecular Formula : C16H16FN5O6
Molecular Weight : 393.33


(3S)-9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic Acid Ethyl Ester (BSC)
(3S)-9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic Acid Ethyl Ester
Catalogue No.:PA BSC 01312512
CAS :
106939-34-8
Molecular Formula : C15H13F2NO4
Molecular Weight : 309.26


(S)-9-Fluoro-3-methyl-10-((2-(methylamino)ethyl)(nitroso)amino)-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic Acid
(S)-9-Fluoro-3-methyl-10-((2-(methylamino)ethyl)(nitroso)amino)-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic Acid
Catalogue No.:PA 12 0131010
CAS :
NA
Molecular Formula : C16H17FN4O5
Molecular Weight : 364.33


(S)-10-((2-Aminoethyl)(nitroso)amino)-9-fluoro-3-methyl-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic Acid
(S)-10-((2-Aminoethyl)(nitroso)amino)-9-fluoro-3-methyl-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylic Acid
Catalogue No.:PA 12 0131012
CAS :
NA
Molecular Formula : C15H15FN4O5
Molecular Weight : 350.31