79405-82-6 Sonderianin Spiro(furan-3(2H),1'(2'H)-naphthalene)-5'-carboxylic acid, 5-(3-furanyl)-3',4,4',4'a,5,7',8',8'a-octahydro-2',4'a-dimethyl-2-oxo-, methyl ester, (1'alpha(S*),2'alpha,4'aalpha,8'abeta)-(-)-