(5R)-8-{[(6S,2R,7R)-4-(2H-Benzo[3,4-d]1,3-dioxolen-5-ylmethyl)-6-methoxy-7-methyl(1,4-oxazaperhydroepin-2-yloxy)]methyl}-1-formyl-5-methyl-10-(methylethyl)tetracyclo[7.4.0.0<2,6