Azithromycin B

Azithromycin B (Azithromycin EP Impurity B), is an impurity of Azithromycin, a semi-synthetic macrolide antibiotic, and related to Erythromycin A.||Synonyms:|(2R,3R,4S,5R,8R,10R,11R,12S,13S,14R)-13-[(2,6-Dideoxy-3-C-methyl-3-O-methyl-α-L-ribo-hexopyranosyl)oxy]-2-ethyl-4,10-dihydroxy-3,5,6,8,10,12,14-heptamethyl-11-[[3,4,6-trideoxy-3-(dimethylamino)-β-D-xylo-hexopyranosyl]oxy]-1-Oxa-6-azacyclopentadecan-15-one; Azithromycin EP Impurity B||CAS No:|307974-61-4||Molecular Formula:|C₃₈H₇₂N₂O₁₁||Molecular Weight:|732.99||Appearance:|White to yellow solid||Purity:|≥95%||Solubility:|Chloroform (Slightly), Methanol (Slightly)||Method for Determining Identity:|Proton NMR Spectroscopic and Mass Spectrometric analysis||TLC Conditions:|SiO2; Dichloromethane: Methanol: Ammounium Hydroxide = 9:1:0.2; Visualized with AMCS and KMnO4; SIngle spot, Rf=0.50||Elemental Analysis:|Calculated: %C: 62.27, %H: 9.90, %N: 3.82||Diethyl Ether:|As Reported||Storage and Stability:|May be stored at RT for short-term only. Long-term storage is recommended at -20°C for 6 months after receipt.