AIDS-187902 AIDS187902 Deoxyerythromycin B Oxacyclotetradecane-2,10-dione, 4-[(2,6-dideoxy-3-C-methyl-3-O-methyl-.alpha.-L-ribo-hexopyranosyl)oxy]-14-ethyl-12-hydroxy-3,5,7,9,11,13-hexamethyl-6-[[3,4,6-trideoxy-3-(dimethylamino)-.beta.-D-xylo-hexopyranosyl]oxy]-, (3R,4S,5R,6S,7S,9R,11R,12S,13R,14R)-