(2R,3S,4S,5S,6R)-6-(((1S,4E,6E,9S,10E,12R,13E,15E,19R)-12-ethyl-9-hydroxy-10,14,16,19-tetramethyl-3-oxo-2,18-dioxabicyclo[15.2.1]icosa-4,6,10,13,15-pentaen-4-yl)methoxy)-4-hydroxy-5-methoxy-2-methyltetrahydro-2H-pyran-3-yl 3,5-dichloro-2-ethyl-4,6-dihydroxybenzoate,(2R,3S,4S,5S,6R)-6-(((1S,4E,6E,9S,10E,12R,13E,15E,19R)-12-ethyl-9-hydroxy-10,14,16,19-tetramethyl-3-oxo-2,18-dioxabicyclo[15.2.1]icosa-4,6,10,13,15-pentaen-4-yl)methoxy)-4-hydroxy-5-methoxy-2-methyltetrahydro-2H-pyran-3-yl 3,5-dichloro-2-ethyl-4,6-dihydroxybenzoate,Fidaxomicin Impurity