Methacholine bromide

Also known as: Acetyl-β-methylcholine bromide, Acetyl-beta-methylcholine bromide, Mecholyl bromide, Methylcholine bromide, 2-Acetoxy-N,N,N-trimethylpropan-1-aminium bromide, 1-Propanaminium, 2-(acetyloxy)-N,N,N-trimethyl-, bromide, UNII:M73AI9718D, EINECS 206-372-2, MFCD00011816

Methacholine bromide (CAS 333-31-3) is a compound in the Organic Bases category listed in the Jingsj chemical database. It has the molecular formula C8H18BrNO2 and a molecular weight of 240.138 g/mol. Key property: a melting point of 147-149ºC(lit.). No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 333-31-3
Jingsj CID: J-20069-1
Molecular Formula: C₈H₁₈BrNO₂
Molecular Weight: 240.138 g/mol
Category: Organic Bases
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	147-149ºC(lit.)
Exact Mass	239.052078
PSA	26.30000

Activity & Biological Data

Additional Information	[1]. Cohen J, et al. Relationship between airway responsiveness to neurokinin A and methacholine in asthma. Pulm Pharmacol Ther. 2005;18(3):171-176. [2]. Anderson SD, et al. Comparison of mannitol and methacholine to predict exercise-induced bronchoconstriction and a clinical diagnosis of asthma. Respir Res. 2009;10(1):4. Published 2009 Jan 23. [3]. Cockcroft DW. Methacholine challenge methods. Chest. 2008;134(4):678-680. [4]. Kabara S, et al. Differential effects of thiopental on methacholine- and serotonin-induced bronchoconstriction in dogs. Br J Anaesth. 2003 Sep;91(3):379-84. [5]. Folkerts G, et al. Bradykinin causes inhibition of methacholine-induced bronchoconstriction in vivo in mice. Naunyn Schmiedebergs Arch Pharmacol. 2001 Jul;364(1):53-8. [6]. Vitorasso RL, et al. Methacholine dose response curve and acceptability criteria of respiratory mechanics modeling. Exp Lung Res. 2020 Feb-Mar;46(1-2):23-31.

Additional Information

[1]. Cohen J, et al. Relationship between airway responsiveness to neurokinin A and methacholine in asthma. Pulm Pharmacol Ther. 2005;18(3):171-176. [2]. Anderson SD, et al. Comparison of mannitol and methacholine to predict exercise-induced bronchoconstriction and a clinical diagnosis of asthma. Respir Res. 2009;10(1):4. Published 2009 Jan 23. [3]. Cockcroft DW. Methacholine challenge methods. Chest. 2008;134(4):678-680. [4]. Kabara S, et al. Differential effects of thiopental on methacholine- and serotonin-induced bronchoconstriction in dogs. Br J Anaesth. 2003 Sep;91(3):379-84. [5]. Folkerts G, et al. Bradykinin causes inhibition of methacholine-induced bronchoconstriction in vivo in mice. Naunyn Schmiedebergs Arch Pharmacol. 2001 Jul;364(1):53-8. [6]. Vitorasso RL, et al. Methacholine dose response curve and acceptability criteria of respiratory mechanics modeling. Exp Lung Res. 2020 Feb-Mar;46(1-2):23-31.

Customs & Trade Information

HS Code	2923900090
Summary	2923900090 other quaternary ammonium salts and hydroxides。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。MFN tariff:6.5%。General tariff:30.0%

Frequently Asked Questions

What is the CAS number of Methacholine bromide?

The CAS number of Methacholine bromide is 333-31-3.

What are the molecular formula and molecular weight of Methacholine bromide?

Methacholine bromide has molecular formula C8H18BrNO2 and molecular weight 240.138 g/mol.

What are the upstream and downstream products of Methacholine bromide?

For Methacholine bromide, Upstream Products: Trimethylamine, Methyl bromide, 1-Dimethylamino-2-propanol.

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. "Methacholine bromide (CAS 333-31-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-20069-1 (accessed 2026-11-09).

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