Chemical structures of the oxygenosterol analogs identified from G. lucidum. Compound 1, ganoderol A [(24E)-3-oxo-5α-lanosta-7,9 (11),24-trien-26-ol]; compound 2, ganoderol B [(24E)-3-ol-5α-lanosta-7,9 (11),24-trien-26-ol]; compound 3, ganoderal A [(24E)-3-oxo-5α-lanosta-7,9 (11),24-trien-26-al]; compound 4, ganoderic acid Y [(24E)-3-ol-5α-lanosta-7,9 (11),24-trien-26-oic acid].