• Skip to primary navigation
  • Skip to main content
  • Skip to footer

LKT Labs

Biochemicals for Life Science Research

  • Products
    • New Products
    • Cancer Biology
    • Cardiovascular
    • Endocrine Signaling and Immunology
    • Metabolic and GI Pathology
    • Microbiology
    • Natural Products
    • Neuroscience
    • Peptides
    • Pharmaceutical Impurities and Derivatives
    • Stem Cell Modulators
  • Services
    • Custom Synthesis
    • Natural Product Isolation
    • Analytical Services
  • Int’l Distributors
  • Support
    • About LKT Labs
    • General Inquiry
    • Bulk Quote Request
    • Document Request
    • Technical Support
    • Catalog Request
    • Product Flyers
  • Contact Us
  • Cart
  • Login / Register
Rifaximin

Rifaximin

Product ID R3321
Cas No. 80621-81-4
Purity ≥98%
Product Unit SizeCostQuantityStock
500 mg $133.00 In stock
1 g $170.00 In stock
5 g $735.00 In stock
Bulk Quote

Quicklinks

  • Description
  • Product Info
  • Shipping and Storage
  • Downloads
  • References
  • Description
  • Product Info
  • Shipping and Storage
  • Downloads
  • References
  • Custom Order

Description

Rifaximin is a rifampicin derivative with weaker absorption kinetics; it inhibits DNA-dependent RNA polymerase. Rifaximin is an ansamycin antibacterial compound that is clinically used to treat small intestinal bacterial overgrowth in subjects with inflammatory bowel syndrome (IBS).

Product Info

Cas No.

80621-81-4

Purity

≥98%

Formula

C43H51N3O11

Formula Wt.

785.88

Chemical Name

[2S-(2R*,16Z,18E,20R*,21R*,22S*,23S*,24S*,25R*,26S*,27R*,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]- pyridol[1,2-a]benzimidazole-1,15(2H)-dione

IUPAC Name

[(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[23.10.1.14,7.05,35.026,34.027,32]heptatriaconta-1(35),2,4,9,19,21,25(36),26(34),28,30,32-undecaen-13-yl] acetate

Synonym

Rifacol, XIFAXAN, Fatroximin, Normix, Rifacol

Melting Point

200-205°C (dec)

Solubility

Soluble in alcohols, ethyl acetate, chloroform or toluene.

Appearance

A Red Orange Powder

Shipping and Storage

Store Temp

4°C

Ship Temp

Ambient

Downloads

MSDS

R3321 MSDS PDF

Info Sheet

R3321 Info Sheet PDF

References

Huhulescu S, Sagel U, Fiedler A, et al. Rifaximin disc diffusion test for in vitro susceptibility testing of Clostridium difficile. J Med Microbiol. 2011 Aug;60(Pt 8):1206-12. PMID: 21292853.

Majewski M, McCallum RW. Results of small intestinal bacterial overgrowth testing in irritable bowel syndrome patients: clinical profiles and effects of antibiotic trial. Adv Med Sci. 2007;52:139-42. PMID: 18217406.

Custom Order

  • Size of single unit expressed as number (e.g. '500' in the case of 500 mg)
  • Total quantity of unit size desired (e.g. '10' in the case of 10 x 500 mg). If only one unit is desired, you may leave this blank.
  • This field is for validation purposes and should be left unchanged.

Related Products

  • P6004

    PP-242

    Dual mTORC1/mTORC2 inhibitor.

    ≥98%
  • L961000

    LY-3295668

    Aurora kinase A inhibitor

    ≥99%
  • A724092

    Asciminib Hydrochloride

    Allosteric inhibitor

    ≥98%
  • A6979

    Dihydroartemisinin

    Sesquiterpene lactone derived from Artemesia; m...

    ≥96%
  • N3213

    Nidulal

    Sesquiterpene found in Nidula.

    ≥95%
  • C9881

    Cytochalasin D

    Mycotoxin produced by Aspergillus; actin polyme...

    ≥98%
  • P2857

    Phorbol-12-myristate-13-acetate

    PKC activator, carcinogen.

    ≥98%
  • E6257

    Epothilone B

    Microtubule depolymerization inhibitor.

    ≥98%
  • L0076

    Latrunculin A

    Thiazolidine macrolide found in the Red Sea spo...

  • T2800

    Thalidomide

    Immunomodulator; teratogen.

    ≥98%
  • O0830

    Ochratoxin B

    Non-chlorinated analogue of the mycotoxin Ochra...

    ≥99%
  • R0020

    RAF265

    B-Raf, VEGFR2, c-Raf, PDGFR, CSF-1R, RET, c-Kit...

    ≥98%
  • E5219

    Endothelin-1, human

    Endogenous peptide involved in vascular contrac...

    ≥95%
  • R1878

    Retinyl Acetate

    Vitamin A derivative, acetate ester of retinol....

    ≥98%
  • C0156

    9-Nitro-20S-camptothecin

    Camptothecin derivative; topoisomerase I inhibi...

    ≥98%
  • S4932

    SMI-4a

    Thiazolidine; Pim kinase inhibitor.

    ≥99%
  • E4785

    Elvitegravir

    Integrase inhibitor.

    ≥98%
  • L9704

    LY-2603618

    Chk1 inhibitor.

    ≥98%
  • M184774

    5-(Methylsulfinyl)pentyl Nitrile

    Synthetic compound related to sulforaphane.

    ≥98%
  • B8277

    Butein

    Flavonoid found in Rhus verniciflua and Butea m...

    ≥99%

Footer

  • Contact Us
  • About Us
  • Site Map
  • Terms and Conditions
LKT Laboratories, Inc.
545 Phalen Blvd.
St. Paul MN, 55130

Ph: (888)-558-5227
Fax: (888)-558-7329

©2026 LKT Laboratories, All Rights Reserved - Products for research use only