Moxidectin - Impurity K

174756-99-1

(2aE,4E,4'E,5'S,6R,6'S,8E,11R,13R,15S,17aR,20R,20aR,20bS)-6'-[(1E)-1,3-Dimethyl-1-buten-1-yl]-20b-hydroxy-4'-(methoxyimino)-5',6,8,19-tetramethyl-17-oxo-3',4',5',6,6',10,11,14,15,17,17a,20,20a,20b-tetradecahydro-2H,7H-spiro[11,15-methanofuro[4,3,2-pq][2,6]benzodioxacyclooctadecine-13,2'-pyran]-20-yl 4-nitrobenzoate; 20-Nitrobenzoylmoxidectin; (2aE,4E,5′R,6R,6′S,8E,11R,13S,15S,17aR,20R,20aR,20bS)-5′,6,6′,7,10,11,14,15,17a,20,20a,20b-Dodecahydro-20b-hydroxy-6′-[(E)-4-methylpent-2-en-2-yl]-20-(4-nitrobenzoyloxy)-5′,6,8,19-tetramethylspiro[11,15-methano-2H,13H,17H-furo[4,3,2-pq][2,6]benzodioxacyclooctadecin-13,2′-[2H]pyran]-4′,17(3′H)-dione 4′-(E)-(O-methyloxime) (USP);