Objective To study the chemical constituents of the ethyl acetate extracts from Inonotus obliquus and preliminarily screen out the monomeric compounds with antitumor activity. Methods The constituents of the ethyl acetate extracts from Inonotus obliquus were isolated bypreparative high performance liquid chromatography(pHPLC),following by macroporous resin HPD100,Sephadex LH-20,MCI and silica gel column chromatography. The structures were identified by NMR. The SGC-7901 cells,HepG2 cells and U-87 cells were...