Methyl 4-hydroxy-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide

Also known as: Methyl 4-hydroxy-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide, 4-Hydroxy-2H-1,2-benzothiazine-3-carboxylic acid methyl ester 1,1-dioxide, Piroxicam impurity G, Piroxicam EP impurity G, methyl 4-hydroxy-1,1-dioxo-2H-1λ⁶,2-benzothiazine-3-carboxylate, Methyl 4-hydroxy-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide (Piroxicam Impurity G)

Methyl 4-hydroxy-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide (CAS 35511-14-9) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C10H9NO5S and a molecular weight of 255.24700 g/mol. Key properties include a melting point of 168-170ºC, a boiling point of 447ºC at 760mmHg, a density of 1.568g/cm3 and a flash point of 224.2ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 35511-14-9
Jingsj CID: J-1092319-0
Molecular Formula: C₁₀H₉NO₅S
Molecular Weight: 255.24700 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	168-170ºC
Boiling Point	447ºC at 760mmHg
Density	1.568g/cm3
Flash Point	224.2ºC
Exact Mass	255.02000
PSA	101.08000
LogP	1.78770
Refractive Index	1.639

Customs & Trade Information

HS Code	2934991000
Summary	2934991000. sultones and sultams. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:30.0%

Frequently Asked Questions

What is the CAS number of Methyl 4-hydroxy-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide?

The CAS number of Methyl 4-hydroxy-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide is 35511-14-9.

What are the molecular formula and molecular weight of Methyl 4-hydroxy-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide?

Methyl 4-hydroxy-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide has molecular formula C10H9NO5S and molecular weight 255.24700 g/mol.

What are the upstream and downstream products of Methyl 4-hydroxy-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide?

For Methyl 4-hydroxy-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide, Upstream Products: methyl 2-(1,1,3-trioxo-1,2-benzothiazol-2-yl)acetate, Saccharin sodium, Saccharin; Downstream Products: Methyl 4-hydroxy-2-methyl-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide, Piroxicam, Isoxicam.

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. "Methyl 4-hydroxy-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide (CAS 35511-14-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1092319-0 (accessed 2026-11-09).

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