... ,6'R,8R,12S,13S,20R,21R,24S)-6'-[(S)-sec-butyl]-21,24-dihydroxy-5',11,13,22-tetramethyl-2 ... ,6-dideoxy-3-O-methyl-a-L-arabino-hexopyranosyl)-3-O-methyl-a-L-arabino-hexopyranoside (i) mixture with (10E,14E,16E,22Z ... -hexopyranosyl)-3-O-methyl-a-L-arabino-hexopyranoside (ii) (4:1); 5-O-demethylavermectin A1a (i) mixture with 5-O-demethyl-25 ...