(2aE,4E,5'S,6S,6'R,7S,8E,11R,13S,15S,17aR,20R,20aR,20bS)-6'-(S)-sec-Butyl-5',6,6',7,10,11,14,15,17a,20,20a,20b-dodecahydro-20,20b-dihydroxy-5',6,8,19-tetramethyl-17-oxospiro(11,15-methano-2H,13H,17H-furo(4,3,2-pq)(2,6)benzodioxacyclooctadecin-13,2'-(2H)pyran)-7-yl-4-O-(4-acetamido-2,4,6-trideoxy-3-O-methyl-alpha-L-lyxo-hexopyranosyl)-2,6-dideoxy-3-O-methyl-alpha-L-arabino-hexo (4''R)-4''-(Acetylamino)-5-O-demethyl-4''-deoxyavermectin A1a 133305-88-1 Avermectin A(sub 1a), 4''-(acetylamino)-5-O-demethyl-4''-deoxy-, (4''R)- Avermectin A1a, 4''-(acetylamino)-5-O-demethyl-4''-deoxy-, (4''R)- Eprinomectin component B(sub 1a) Eprinomectin component B1a