Rifaximin

利福昔明

Also known as: Xifaxan, Normix, Rifacol, L-105, L-105SV, 4-Desoxy-4'-methylpyridino[1',2'-1,2]imidazo[5,4-c]rifamycin SV, (2S,16Z,18E,20S,21S,22R,23R,24R,25S,26R,27S,28E)-25-(Acetyloxy)-5,6,21,23-tetrahydroxy-27-methoxy-2,4,11,16,20,22,24,26-octamethyl-2,7-(epoxypentadeca[1,11,13]trienimino)benzofuro[4,5-e]pyrido[1,2-a]benzimidazole-1,15(2H)-dione, (7S,9E,11S,12R,13S,14R,15R,16R,17S,18S,19E,21Z)-2,15,17,36-tetrahydroxy-11-methoxy-3,7,12,14,16,18,22,30-octamethyl-6,23-dioxo-8,37-dioxa-24,27,33-triazahexacyclo[23.10.1.1.0.0.0]heptatriaconta-1(35),1(36),2,4,9,19,21,25,28,30,32,34-dodecaen-13-yl acetate, MFCD00864973

Rifaximin (CAS 80621-81-4) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C43H51N3O11 and a molecular weight of 785.878 g/mol. It is also known as Xifaxan, Normix and Rifacol. Key properties include a melting point of 200-205ºC(dec) and a density of 1.4±0.1 g/cm3. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 80621-81-4
Jingsj CID: J-19229-3
Molecular Formula: C₄₃H₅₁N₃O₁₁
Chinese Name: 利福昔明
Molecular Weight: 785.878 g/mol
Category: Organic Compounds
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	200-205ºC(dec)
Density	1.4±0.1 g/cm3

Frequently Asked Questions

What is the CAS number of Rifaximin?

The CAS number of Rifaximin is 80621-81-4.

What are the molecular formula and molecular weight of Rifaximin?

Rifaximin has molecular formula C43H51N3O11 and molecular weight 785.878 g/mol.

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

Last updated: 8/21/2026

How to cite: Jingsj. "Rifaximin (CAS 80621-81-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-19229-3 (accessed 2026-10-24).

Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.