(5R)-7-{[(3S,4S,2R,5R,6R)-4-((2Z,4E)-2-Methylhexa-2,4-dienoyloxy)-3-hydroxy-5-methoxy-6-methylperhydropyran-2-yloxy]methyl}-1-formyl-5-methyl-9-(methylethyl)tetracyclo[6.4.0.0<2,6