Constituents of the fungus Ganoderma lucidum (Fr.) Karst. I. Structures of ganoderic acids C2, E, I, and K, lucidenic acid F and related compounds. - Kikuchi ,T,.; Matsuda ,S,.; Kadota ,S,.; Murai ,Y,.; Tsubono ,K,.; Ogita ,Z.. (Chemical and Pharmaceutical Bulletin, 1986)