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Methylnaltrexone bromide

Also known as: MNTX, MNTX bromide, Naltrexone methylbromide, Naltrexone methobromide, Relistor, MOA-728, MRZ-2663BR, (5alpha)-17-(Cyclopropylmethyl)-4,5-epoxy-3,14-dihydroxy-17-methyl-6-oxomorphinanium bromide, (4R,4aS,7aR,12bS)-3-(cyclopropylmethyl)-4a,9-dihydroxy-3-methyl-2,4,5,6,7a,13-hexahydro-1H-4,12-methanobenzofuro[3,2-e]isoquinoline-3-ium-7-one bromide, Unii-rfo6il3D3m, [14C]-N-Methylnaltrexone bromide

Methylnaltrexone bromide (CAS 73232-52-7) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C21H26BrNO4 and a molecular weight of 436.33900 g/mol. Key property: a melting point of 237-239ºC. It is classified under GHS with signal word Danger and hazard statements H301 — Toxic if swallowed and H400 — Very toxic to aquatic life. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
73232-52-7
Jingsj CID
J-1513936-3
Molecular Formula
C21H26BrNO4
Molecular Weight
436.33900 g/mol
Category
Ketones
Last updated
8/21/2026
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Physicochemical Properties

Melting Point237-239ºC
Exact Mass435.10500
PSA69.59000
LogP3.02510

GHS Safety & Compliance

Acute Toxicity / Environmental HazardSignal word: Danger
  • H301 — Toxic if swallowed
  • H400 — Very toxic to aquatic life

Frequently Asked Questions

What is the CAS number of Methylnaltrexone bromide?

The CAS number of Methylnaltrexone bromide is 73232-52-7.

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

Methylnaltrexone bromide has molecular formula C21H26BrNO4 and molecular weight 436.33900 g/mol.

Is Methylnaltrexone bromide hazardous?

Methylnaltrexone bromide has GHS signal word Danger and hazard statements H301 — Toxic if swallowed; H400 — Very toxic to aquatic life.

What are the upstream and downstream products of Methylnaltrexone bromide?

For Methylnaltrexone bromide, Upstream Products: Methyl bromide, naltrexone.

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

Last updated:

How to cite: Jingsj. "Methylnaltrexone bromide (CAS 73232-52-7)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1513936-3 (accessed 2026-11-09).

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