Milbemycin EP Impurity F

Chemical Name: (1′R,2R,4′S,5S,6R,8′R,10′E,13′R,14′E,16′E,20′S,24′S)-24′-Hydroxy-5,6,11′, 13′,22′-pentamethyl-3,4,5,6-tetrahydrospiro[pyran-2,6′-[3,7,19] trioxatetra cyclo[15.6.1.14,8.020,24]-pentacosa[10,14,16,22]tetraene]- 2′,21′-dione ;