Clarithromycin 

Chemical Name: Clarithromycin ; 6-O-Methylerythromycin A ; (3R,4S,5S,6R,7R,9R,11R,12R,13S,14R)-4-[(2,6-Dideoxy-3-C-methyl-3-O-methyl-α-L-ribo-hexopyranosyl)oxy]-14-ethyl-12,13-dihydroxy-7-methoxy-3,5,7,9,11,13-hexamethyl-6-[[3,4,6-trideoxy-3-(dimethylamino)-β-Dxylo-hexopyranosyl]oxy]oxacyclotetradecane-2,10-dione ;