Avermectin A1a Impurity

Chemical Name: [6S-[2aE,4E,6R*,7R*,8E,11S*,13R*[5′R*,6′S*(R*)],15R*,17aS*,20S*,20aS*,20bR*]]-7-[[2,6-Dideoxy-4-O-(2,6-dideoxy-3-O-methyl-α-L-arabino-hexopyranosyl)-3-O-methyl-α-L-arabino-hexopyranosyl]oxy]-5′,6,6′,7,10,11,14,15,17a,20,20a,20b-dodecahydro-20b-hydroxy-20-methoxy-5′,6,8,19-tetramethyl-6′-(1-methylpropyl)spiro[11,15-methano-2H,13H,17H-furo[4,3,2-pq][2,6]benzodioxacyclooctadecin-13,2′-[2H]pyran]-17-one

Smile: [H][C@@]12[C@H](OC)C(C)=C[C@@]3([H])C(O[C@]([H])(C[C@]4(C=C[C@@H]([C@]([C@H](CC)C)([H])O4)C)O5)C[C@@]5([H])C/C=C(C)/[C@@H](O[C@]6(C[C@@H]([C@H]([C@@H](O6)C)O[C@]7(C[C@@H]([C@H]([C@@H](O7)C)O)OC)[H])OC)[H])[C@@H](C)/C=C/C=C(CO2)/[C@@]31O)=O