5-O-Demethyl-4'',5-bis-O-[(1,1-dimethylethyl)dimethylsilyl]-22,23-dihydro-28-oxo-avermectin A1a

102190-51-2

(1R,4S,5'S,6R,6'R,8R,12S,13S,20R,21R,24S)-6'-[(2S)-Butan-2-yl]-21-[tert-butyl(dimethyl)silyl]oxy-12-[(2R,4S,5S,6S)-5-[(2S,4S,5S,6S)-5-[tert-butyl(dimethyl)silyl]oxy-4-methoxy-6-methyloxan-2-yl]oxy-4-methoxy-6-methyloxan-2-yl]oxy-24-hydroxy-5',11,13,22-tetramethylspiro[3,7,19-trioxatetracyclo[15.6.1.14,8.020,24]pentacosa-10,14,16,22-tetraene-6,2'-oxane]-2,18-dione;