methyl (2Z)-2-[(3aS,4S,5R,6aS)-5-(oxan-2-yloxy)-4-(oxan-2-yloxymethyl)-3,3a,4,5,6,6a-hexahydro-1H-pentalen-2-ylidene]acetate 生成
(1S,5R,6S,7R)-3-methoxycarbonylmethylene-6-(tetrahydropyran-2-yl)oxymethyl-7-(tetrahydropyran-2-yl)oxybicyclo<3.3.0>oct-3-ene