6,8b-Ethano-8bH-cyclopenta[de]-2-benzopyran-1,4-dione, octahydro-10,10-dimethyl-, (3a.alpha.,5a.beta.,6.alpha.,8a.alpha.,8b.alpha.)- 6,8b-Ethano-8bH-indeno[1,7-cd]pyran-1,4-dione, octahydro-10,10-dimethyl- 6,8b-Ethano-8bH-indeno[1,7-cd]pyran-1,4-dione, octahydro-10,10-dimethyl-, (3a.alpha.,5a.beta.,6.alpha.,8a.alpha.,8b.alpha.)- 87480-01-1 NSC284437 QUADRONE