Acetic acid (4R,5S,6S,7R,9R,10S,14R)-6-[3,6-dideoxy-4-O-[2,6-dideoxy-3-C-methyl-4-O-(3-methylbutyryl)-alpha-L-ribo-hexopyranosyl]-3-(dimethylamino)-beta-D-glucopyranosyl]-10-(dimethylamino)-5-methoxy-9,14-dimethyl-2-oxo-7-(2-oxoethyl)oxacyclotetradecan-4-