methyl (1S)-1',2',3',4'-tetrahydro-2'-hydroxy-5',8'-dimethoxyspiro[1,3-dithiolane-2,4'-naphthalene]-2'-carboxylate

(S)-3-<1-(1,1-ethylenedioxy)ethyl>-1,2,3,4-tetrahydro-3-hydroxy-5,8-dimethonaphthalenone

(S)-(-)-1,2,3,4-tetrahydro-5,8-dimethoxy-4-oxo-2-acetyl-2-hydroxynaphthalene cyclic 4-(ethylene mercaptole)