53625-15-3 NSC258599 Spiro[furan-3(2H),6'-[6H]naphtho[1,8-bc]furan]-2,2'(4'H)-dione, 5-(3-furanyl)-3',4,5,5',5'a,7',8',8'a-octahydro-7'-methyl-, [5'aR-[5'a.alpha.,6'.alpha.(S*),7'.alpha.,8'a.alpha.]]- TEUCVIDIN