(-)-Avenaciolide 20223-76-1 Avenaciolid Avenaciolide Furo[3,4-b]furan-2,6(3H,4H)-dione, dihydro-3-methylene-4-octyl- Furo[3,4-b]furan-2,6(3H,4H)-dione, dihydro-3-methylene-4-octyl-, [3aR-(3a.alpha.,4.alpha.,6a.alpha.)]- NSC179483