3533-47-9 NSC106390 Psilostachyin A Spiro[7H-cyclohepta[b]furan-7,2'(5'H)-furan]-2,5'(3H)-dione, octahydro-8-hydroxy-6,8-dimethyl-3-methylene-, [3aS-(3a.alpha.,6.beta.,7.alpha.,8.alpha.,8a.alpha.)]-