Milbemycin EP Impurity I

Chemical Name: (2aE,2′R,2a1S,4E,5′S,6R,6′R,8E,11R,15S,17aR,20aR)-6′-ethyl-2a1,20a-dihydroxy-5′,6,8,19-tetramethyl-2a1,3′,4′,5′,6,6′,7,10,11,14,15,17a,20,20a-tetradecahydrospiro[2H,17H-11,15-methanofuro[4,3,2-pq][2,6]benzodioxacyclooctadecine-13,2′-pyran]-17,20-dione (20a-hydroxy-20-oxomilbemycin A4).

Smile: O=C1[C@]2(O)[C@]3(O)[C@@](C(O[C@]4([H])C[C@@]5(O[C@@](CC)([H])[C@](C)([H])CC5)O[C@@](C/C=C(C)/C[C@@]([H])(C)/C=C/C=C3\CO2)([H])C4)=O)([H])C=C1C