Tosufloxacin tosylate

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MedKoo CAT#: 328210

CAS#: 115964-29-9 (tosylate)

Description: Tosufloxacin, also known as T-3262, is a fluoroquinolone antibiotic used to treat susceptible infections. It has a controversial safety profile in relation to other fluoroquinolones. It is associated with severe thrombocytopenia and nephritis, and hepatotoxicity. It is sold in Japan under the brand name Ozex.

Chemical Structure

Tosufloxacin tosylate
CAS# 115964-29-9 (tosylate)

Theoretical Analysis

MedKoo Cat#: 328210
Name: Tosufloxacin tosylate
CAS#: 115964-29-9 (tosylate)
Chemical Formula: C26H23F3N4O6S
Exact Mass: 404.11
Molecular Weight: 576.547
Elemental Analysis: C, 54.16; H, 4.02; F, 9.89; N, 9.72; O, 16.65; S, 5.56

Price and Availability

Size Price Availability Quantity
100mg USD 150 Ready to ship
200mg USD 250 Ready to ship
500mg USD 550 Ready to ship
1g USD 950 2 Weeks
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Related CAS #: 100490-36-6 (free base)   115964-29-9 (tosylate)   104051-69-6 (HCl),  

Synonym: Tosufloxacin; T-3262; T3262; T 3262; Tosufloxacin tosylate

IUPAC/Chemical Name: 7-(3-aminopyrrolidin-1-yl)-1-(2,4-difluorophenyl)-6-fluoro-4-oxo-1,4-dihydro-1,8-naphthyridine-3-carboxylic acid tosylate


InChi Code: InChI=1S/C19H15F3N4O3.C7H8O3S/c20-9-1-2-15(13(21)5-9)26-8-12(19(28)29)16(27)11-6-14(22)18(24-17(11)26)25-4-3-10(23)7-25;1-6-2-4-7(5-3-6)11(8,9)10/h1-2,5-6,8,10H,3-4,7,23H2,(H,28,29);2-5H,1H3,(H,8,9,10)

SMILES Code: O=C(C1=CN(C2=CC=C(F)C=C2F)C3=NC(N4CC(N)CC4)=C(F)C=C3C1=O)O.OS(=O)(C5=CC=C(C)C=C5)=O

Appearance: Solid powder

Purity: >98% (or refer to the Certificate of Analysis)

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition: Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Solubility: Soluble in DMSO

Shelf Life: >2 years if stored properly

Drug Formulation: This drug may be formulated in DMSO

Stock Solution Storage: 0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code: 2934.99.9001

More Info:

Biological target:
In vitro activity:
In vivo activity:

Preparing Stock Solutions

The following data is based on the product molecular weight 576.55 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Recalculate based on batch purity %
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL
Formulation protocol:
In vitro protocol:
In vivo protocol:

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1: Kim YD, Kim MK, Wee WR, Choi HJ. Tosufloxacin deposits in compromised corneas. Optom Vis Sci. 2014 Sep;91(9):e241-4. doi: 10.1097/OPX.0000000000000348. PubMed PMID: 25036547.

2: Niu H, Cui P, Yee R, Shi W, Zhang S, Feng J, Sullivan D, Zhang W, Zhu B, Zhang Y. A Clinical Drug Library Screen Identifies Tosufloxacin as Being Highly Active against Staphylococcus aureus Persisters. Antibiotics (Basel). 2015 Jul 31;4(3):329-36. doi: 10.3390/antibiotics4030329. PubMed PMID: 27025627; PubMed Central PMCID: PMC4790289.

3: Kawai Y, Miyashita N, Kubo M, Akaike H, Kato A, Nishizawa Y, Saito A, Kondo E, Teranishi H, Ogita S, Tanaka T, Kawasaki K, Nakano T, Terada K, Ouchi K. Therapeutic efficacy of macrolides, minocycline, and tosufloxacin against macrolide-resistant Mycoplasma pneumoniae pneumonia in pediatric patients. Antimicrob Agents Chemother. 2013 May;57(5):2252-8. doi: 10.1128/AAC.00048-13. Epub 2013 Mar 4. PubMed PMID: 23459497; PubMed Central PMCID: PMC3632908.

4: Deng FY, Huang CX, Liu Y. [Mn2+-cTMAB-sensitized fluorescent microscopic determination of tosufloxacin tosylate based on a self-ordered ring]. Guang Pu Xue Yu Guang Pu Fen Xi. 2014 Feb;34(2):445-9. Chinese. PubMed PMID: 24822418.

5: Shinohara A, Yoshiki Y, Masamoto Y, Hangaishi A, Nannya Y, Kurokawa M. Moxifloxacin is more effective than tosufloxacin in reducing chemotherapy-induced febrile neutropenia in patients with hematological malignancies. Leuk Lymphoma. 2013 Apr;54(4):794-8. doi: 10.3109/10428194.2012.725848. Epub 2013 Jan 2. PubMed PMID: 22978686.

6: Sakata H. [Clinical efficacy of tosufloxacin in children with pneumonia due to Mycoplasma pneumoniae]. Jpn J Antibiot. 2012 Jun;65(3):173-9. Japanese. PubMed PMID: 23173293.

7: Choi MK, Woo HY, Heo J, Cho M, Kim GH, Song GA, Kim MB. Toxic epidermal necrolysis associated with sorafenib and tosufloxacin in a patient with hepatocellular carcinoma. Ann Dermatol. 2011 Dec;23(Suppl 3):S404-7. doi: 10.5021/ad.2011.23.S3.S404. Epub 2011 Dec 27. PubMed PMID: 22346290; PubMed Central PMCID: PMC3276809.

8: Sunakawa K, Onai K, Yamazaki T. [Intractable pediatric infectious disease: examining the ability of a new drug, tosufloxacin tosilate hydrate for pediatric (discussion)]. Jpn J Antibiot. 2011 Oct;64(5):269-80. Japanese. PubMed PMID: 22428211.

9: Fukuda Y, Takahata M, Mitsuyama J. Pharmacodynamic evaluation of tosufloxacin against Streptococcus pneumoniae in an in vitro model simulating serum concentration. J Infect Chemother. 2006 Feb;12(1):1-8. PubMed PMID: 16506083.

10: Arguedas AG, Akaniro JC, Stutman HR, Marks MI. In vitro activity of tosufloxacin, a new quinolone, against respiratory pathogens derived from cystic fibrosis sputum. Antimicrob Agents Chemother. 1990 Nov;34(11):2223-7. PubMed PMID: 2073112; PubMed Central PMCID: PMC172026.