547.972Cinnamomum insulari-montanum Hayata (Lauraceae) is an endemic tree that grows in Taiwancs natural hardwood forest at elevations between 400 and 1500 m [1]. In the course of screening for biologically and chemically novel agents from Formosan Lauraceous plants [2][3][4][5][6][7][8][9][10][11][12][13][14][15], C. insulari-montanum Hayata was chosen for further phytochemical investigation. In this paper, we reinvestigated the constituents in the stems of C. insulari-montanum Hayata [16][17][18][19][20][21]. The MeOH extract of its stems was subjected to solvent partitioning and chromatographic separation to afford eight pure substances. The chemical constituents in the stems of C. insulari-montanum Hayata were separated with column chromatography. Seven compounds, including a mixture of E-sitosterol (1) and stigmasterol (2) [22], coumarin (3) [14], cinnamyl alcohol (4) [14], cinnamic acid (5) [14], p-hydroxybenzoic acid (6) [14], kaempferol (7) [15], and kaempferitrin (8) [15], were isolated from the stems of C. insulari-montanum Hayata. All of these compounds were found for the first time in this plant.