(5R)-2,4-Dideoxy-1-C-{(2S,3R,4S)-4-[(2R,3S,4E,6E,9R,10S,11S,12R,13R,14E,16Z)-11-ethyl-10,12-dihydroxy-3,17-dimethoxy-7,9,13,15-tetramethyl-18-oxooxacyclooctadeca-4,6,14,16-tetraen-2-yl]-3-hydroxy-2-pe
ntanyl}-4-methyl-5-[(1E)-1-propen-1-yl]-α-D-threo-pentopyranose