3-acetoxy-3-acetyl-1,1-ethylenedioxy-1,2,3,4-tetrahydro-5,8-dimethoxynaphthalene

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

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

(R)-3-(1,1-ethylenedioxyethyl)-1,2,3,4-tetrahydro-3-hydroxy-5,8-dimethoxy-1-oxo-naphthalene

(R)-3'-acetyl-1',2',3',4'-tetrahydro-3'-hydroxy-5',8'-dimethoxyspiro[1,3-dithiolane-2,1'-naphthalene]