Ethyl (S)-9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylate

Also known as: Levofloxacin cyclized ester, Levofloxacin cyclization ester, Levofloxacin acid ester, Levofloxacin Ethyl Ester, Levofloxacin carboxylic acid, ethyl ester, (S)-Ethyl 9,10-difluoro-3-methyl-7-oxo-3,7-dihydro-2H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylate, Ethyl (3S)-9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7H-[1,4]oxazino[2,3,4-ij]quinoline-6-carboxylate, (-)-ethyl 9,10-difluoro-2,3-dihydro-3-methyl-7-oxo-7H-pyrido[1,2,3-de][1,4]benzoxazine-6-carboxylate, ethyl (S)-(-)-9,10-difluoro-2,3-dihydro-3-methyl-7-oxo-7H-pyrido[1,2,3-de][1,4]benzoxazine-6-carboxylate, (S)-9,10-Difluoro-2,3-dihydro-3-methyl-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic Acid Ethyl Ester, 7H-Pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid, 9,10-difluoro-2,3-dihydro-3-methyl-7-oxo-, ethyl ester, (3S)-, 7H-1,4-Oxazino[2,3,4-ij]quinoline-6-carboxylic acid, 9,10-difluoro-2,3-dihydro-3-methyl-7-oxo-, ethyl ester, (3S)-, Levofiexacin acid ester

Ethyl (S)-9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylate (CAS 106939-34-8) is a compound in the Esters category listed in the Jingsj chemical database. It has the molecular formula C15H13F2NO4 and a molecular weight of 309.265 g/mol. Key properties include a melting point of 258-260ºC, a boiling point of 442.2±45.0 °C at 760 mmHg, a density of 1.4±0.1 g/cm3 and a flash point of 221.2±28.7 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 106939-34-8
Jingsj CID: J-1109925-7
Molecular Formula: C₁₅H₁₃F₂NO₄
Molecular Weight: 309.265 g/mol
Category: Esters
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	258-260ºC
Boiling Point	442.2±45.0 °C at 760 mmHg
Density	1.4±0.1 g/cm3
Flash Point	221.2±28.7 °C
Exact Mass	309.081268
PSA	57.53000
LogP	1.28
Vapor Pressure	0.0±1.1 mmHg at 25°C
Refractive Index	1.582

Customs & Trade Information

HS Code	2934999090
Summary	2934999090. other heterocyclic compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of Ethyl (S)-9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylate?

The CAS number of Ethyl (S)-9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylate is 106939-34-8.

What are the molecular formula and molecular weight of Ethyl (S)-9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylate?

Ethyl (S)-9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylate has molecular formula C15H13F2NO4 and molecular weight 309.265 g/mol.

What are the upstream and downstream products of Ethyl (S)-9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylate?

For Ethyl (S)-9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylate, Upstream Products: Diethyl ethoxymethylenemalonate; Downstream Products: Levofloxacin carboxylic acid.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "Ethyl (S)-9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylate (CAS 106939-34-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1109925-7 (accessed 2026-11-06).

Data for reference only; verify product details with suppliers before purchase.