(5R,9R)-8-({(6S,2R,7R)-6-Hydroxy-2-methyl-4-[(4-methyloxolan-2-yl)methyl](1,4-oxazaperhydroepin-7-yloxy)}methyl)-1-formyl-5-methyl-10-(methylethyl)tetracyclo[7.4.0.0<2,6