Phenanthro(9,10-b)phenanthro(9',10':5,6)pyrano(3,4-d)pyran-9,19-dion

3-(10-Hydroxy-9-phenanthryl)-2-oxo-2H-phenanthro(9,10-b)pyran-4-carbonsaeureethylester

9a-Ethoxy-9aH-phenanthro(9,10-b)phenanthro(9',10':4,5)furo(3,2-e)pyran-19-carbonsaeureethylester

(Z)-2,2,2',2'-Tetraethoxy-Δ3,3'(2H,2'H)-bi[phenanthro[9,10-b]furan]

3-(10-Hydroxy-9-phenanthryl)-2-oxo-2H-phenanthro[9,10-b]pyran-4-carbonsaeure