methyl 1,1-ethylenedioxy-1,2,3,4-tetrahydro-3-hydroxy-5,8-dimethoxynaphthalene-3-carboxylate

3'-acetoxy-3'-acetyl-1',2',3',4'-tetrahydro-5',8'-dihydroxyspiro<1,3-dithiolan-2,1'-naphthalene>

methyl 3'-acetoxy-1',2',3',4'-tetrahydro-5',8'-dihydroxyspiro<1,3-dithiolan-2,1'-naphthalene>-3'-carboxylate

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

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