Name:Rifaximin Molecular Formula:C43H51N3O11CAS Registry Number:80621-81-4Synonyms:L 105; L 105(ansamacrolide antibiotic); L 105SV; Rifamycin L 105; Rifamycin L 105SV; Xifaxan; refaximin; Chemical PropertiesAppearance:Red-Orange Crystalline PowderMolecular Weight:785.87854Density:1.366 gcm3Melting Point:200-205C(dec)Storage Temperature:0-6CRefractive index:1.633Solubility:soluble in ethyl alcohol and chloroformUsage:Non-absorbable semisynthetic Rifamycin antibiotic