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Cyclothiazide chemical structure, C14H16ClN3O4S2, CAS 2259-96-3
2D chemical structure

Key facts

What buyers check first

Appearance
Crystals from dilute alcohol
Melting point
234 °C
Solubility
FREELY SOL IN ACETONE, ETHYL ACETATE, METHANOL, SPARINGLY SOL IN ALC, PRACTICALLY INSOL…
HS code
293590
Category
Cardiovascular and metabolic drugs
Illustrative photo, assorted laboratory chemical bottles and jars on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Cyclothiazide?

Plain description, key identifiers and synonyms

Cyclothiazide is 3,4-Dihydro-2H-1,2,4-benzothiadiazine 1,1-dioxide substituted at positions 3, 5 and 6 by a 2-norbornen-5-yl group, chlorine, and a sulfonamide group, respectively. A thiazide diuretic, it has been used in the management of hypertension and oedema. It has a role as a diuretic and an antihypertensive agent.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
3-(2-bicyclo[2.2.1]hept-5-enyl)-6-chloro-1,1-dioxo-3,4-dihydro-2H-1λ6,2,4-benzothiadiazine-7-sulfonamide
CAS number
2259-96-3 CAS number cross-checked
EC number
218-859-7
Molecular formula
C14H16ClN3O4S2
UNII
P71U09G5BW
MDL number
MFCD00210192
InChIKey
BOCUKUHCLICSIY-UHFFFAOYSA-N
InChI
InChI=1S/C14H16ClN3O4S2/c15-10-5-11-13(6-12(10)23(16,19)20)24(21,22)18-14(17-11)9-4-7-1-2-8(9)3-7/h1-2,5-9,14,17-18H,3-4H2,(H2,16,19,20)
SMILES (canonical and isomeric)
C1C2CC(C1C=C2)C3NC4=CC(=C(C=C4S(=O)(=O)N3)S(=O)(=O)N)Cl

Synonyms

  • Anhydron
  • Aquirel
  • Fluidil
  • Renazide
  • Valmiran
  • Doburil
  • Ciclotiazida
  • Ciclotiazide
  • Cyclothiazidum
  • MDi 193
  • Lilly 35,483
  • 6-Chloro-3,4-dihydro-3-(5-norbornen-2-yl)-2H-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide
  • 6-Chloro-3,4-dihydro-3-(2-norbornen-5-yl)-2H-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide
  • 6-Chloro-3,4-dihydro-3-(2-norbornen-5-yl)-7-sulfamoyl-1,2,4-benzothiadiazine 1,1-dioxide
  • 6-Chloro-3-(2-norbornen-5-yl)-7-sulfamyl-3,4-dihydro-1,2,4-benzothiadiazine 1,1-dioxide
  • 2H-1,2,4-Benzothiadiazine-7-sulfonamide, 6-chloro-3,4-dihydro-3-(5-norbornen-2-yl)-, 1,1-dioxide
  • 2H-1,2,4-Benzothiadiazine-7-sulfonamide, 3-bicyclo(2.2.1)hept-5-en-2-yl-6-chloro-3,4-dihydro-, 1,1-dioxide
  • 2H-1,2,4-Benzothiadiazine-7-sulfonamide, 3-bicyclo[2.2.1]hept-5-en-2-yl-6-chloro-3,4-dihydro-, 1,1-dioxide
  • 6-Chloro-3,4-dihydro-3-(norbornen-2-yl)-2H-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide
  • 3-{bicyclo[2.2.1]hept-5-en-2-yl}-6-chloro-1,1-dioxo-3,4-dihydro-2H-1$l^{6},2,4-benzothiadiazine-7-sulfonamide
  • 3-(bicyclo(2.2.1)hept-5-en-2-yl)-6-chloro-1,1-dioxo-3,4-dihydro-2H-1$l^(6),2,4-benzothiadiazine-7-sulfonamide
  • 6-Chloro-3,4-dihydro-3-(2-norbornen-5-yl)-2H-1,2-4-benzothiadiazine-7-sulfonamide 1,1-dioxide
  • 2H-1,2,4-Benzothiadiazine-7-sulfonamide,3-bicyclo[2.2.1]hept-5-en-2-yl-6-chloro-3,4-dihydro-, 1,1-dioxide
  • 3-(2-bicyclo[2.2.1]hept-5-enyl)-6-chloro-1,1-dioxo-3,4-dihydro-2H-1lambda6,2,4-benzothiadiazine-7-sulfonamide
  • 3-(bicyclo[2.2.1]hept-5-en-2-yl)-6-chloro-3,4-dihydro-2H-benzo[e][1,2,4]thiadiazine-7-sulfonamide 1,1-dioxide
Show all 33 synonyms
  • 3-Bicyclo(2.2.1)hept-5-en-2-yl-6-chloro-3,4-dihydro-2H-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide
  • Anhydron (TN)
  • 3-Bicyclo[2.2.1]hept-5-en-2-yl-6-chloro-3,4-dihydro-2H-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide
  • Cyclothiazide (JAN/USAN/INN)
  • 3-(bicyclo[2.2.1]hept-5-en-2-yl)-6-chloro-3,4-dihydro-2H-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide
  • Lilly 35483, MDi 193, Renazide, Valmiran
  • Cyclothiazide (Standard)
  • Lilly 35483

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Crystals from dilute alcoholexp.
Odour
PRACTICALLY ODORLESSexp.
Melting point
234 °Cexp.
Solubility
FREELY SOL IN ACETONE, ETHYL ACETATE, METHANOL, SPARINGLY SOL IN ALC, PRACTICALLY INSOL IN WATER, PRACTICALLY INSOL IN CHLOROFORM, ETHERexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
389.89 g/molcalc.
Exact mass
389.0271 Dacalc.
LogP (octanol/water)
1.23calc.
Topological polar surface area
118.4 Ųcalc.
Hydrogen bond donors
3calc.
Hydrogen bond acceptors
5calc.
Rotatable bonds
2calc.
Heavy atoms
24calc.
Rings
4calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0.43calc.
Formal charge
0calc.
Stereocentres
4calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, O=S1(=O)NC(C2CC3C=CC2C3)Nc2ccccc21

O=S1(=O)NC(C2CC3C=CC2C3)Nc2ccccc21

4 rings, 19 atoms.

1 other chemical share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (16)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Cyclothiazide suppliers

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Where suppliers are based

26 suppliers in 7 countries

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Cyclothiazide price

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Uses and applications

What the substance is used for, by industry and function

Therapeutic category: Diuretic, antihypertensive. THERAP CAT (VET): Diuretic.

Use classes: Pharmaceuticals.

Industries and functions

Pharmacological actions

  • Antihypertensive Agents
  • Diuretics

Roles

  • antihypertensive agent
  • cardiovascular drug
  • diuretic
  • pharmaceutical

Pharmacology

Cyclothiazide is a benzothiadiazide belonging to the class of thiazide diuretics. Cyclothiazide is indicated as adjunctive therapy in edema and in the treatment of hypertension. In addition, this agent is capable of inhibiting rapid desensitization of the ionotropic alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA)-type glutamate receptors, thereby potentiating glutamate responses which may induce seizures activity. Cyclothiazide was also found to inhibit gamma-aminobutyric acid (GABA)-A receptors.

How it is made

Prepn: C.W. Whitehead et al., J Org Chem 26, 2814 (1961), E. Muller, K. Hasspacher, U.S. pat 3,275,625 (1966 to Boehringer, Ong).

3-Chloroaniline is acylated with chlorosulfonic acid to produce 4,6-disulfonyl chloride which is then amidated with ammonia to give 4,6-disulfonamide. Heating latter with 5-norbornene-2-carboxaldehyde results in cyclization through double condensation. Patent 3,275,625.

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Cyclothiazide is traded under.

HS 2935.90Indicative HS code

Sulphonamides, other

World exports in 2024
$5.64B
−11.0% vs 2023, imports $8.56B
2019 to 2024
Top exporters
  1. Ireland43.1%
  2. China12.0%
  3. India * partner reported9.5%
Top importers
  1. United States23.6%
  2. Slovenia19.1%
  3. Spain11.7%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Cyclothiazide is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Cyclothiazide, based on the data on this page

What is Cyclothiazide?

Cyclothiazide is 3,4-Dihydro-2H-1,2,4-benzothiadiazine 1,1-dioxide substituted at positions 3, 5 and 6 by a 2-norbornen-5-yl group, chlorine, and a sulfonamide group, respectively. A thiazide diuretic, it has been used in the management of hypertension and oedema.

What is the CAS number of Cyclothiazide?

The CAS registry number of Cyclothiazide is 2259-96-3.

What is the molecular formula and weight of Cyclothiazide?

The molecular formula of Cyclothiazide is C14H16ClN3O4S2 and its molar mass is 389.89 g/mol.

What is Cyclothiazide used for?

Therapeutic category: Diuretic, antihypertensive. THERAP CAT (VET): Diuretic. Use classes: Pharmaceuticals.

Is Cyclothiazide hazardous?

Cyclothiazide carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Cyclothiazide?

Cyclothiazide is usually classified under HS code 293590 (Sulphonamides, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Cyclothiazide?

CompoundList lists 26 suppliers of Cyclothiazide in United States, China, United Kingdom, France and 3 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Cyclothiazide?

Suppliers quote Cyclothiazide on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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