Fidaxomicin Impurity 1

Chemical Name: (2S,3R,4R,5R,6S)-6-(((3E,5E,8R,9E,11R,12S,13E,15E,17R)-11-ethyl-8-hydroxy-12-(((2S,3R,4R,5R)-3-hydroxy-4-(isobutyryloxy)-5,6,6-trimethyltetrahydro-2H-pyran-2-yl)oxy)-17-((R)-1-hydroxyethyl)-9,13,15-trimethyl-2-oxooxacycloheptadeca-3,5,9,13,15-pentaen-3-yl)methoxy)-4-hydroxy-5-methoxy-2-methyltetrahydro-2H-pyran-3-yl 3,5-dichloro-2-ethyl-4,6-dihydroxybenzoate