[Chemical constituents about the stem of Rabdosia excisa].

OBJECTIVE: To investigate the constituents of the stem of Rabdosia excisa. METHOD: Compounds were separated and purified by silica gel column chromatography and their structures were determined by spectroscopic method. RESULT: Thirteen compounds isolated from this plant were identified as rabdesimte( 1 ), maoyecrystal E (2), 6beta,11alpha,15alpha-trihydroxy-6,7-seco-6,20-epoxy-1alpha, 7-ol-ide-ent-kaur-16-en (3), enmenol-glucoside (4), oridonol (5), macrocalyxin G (6), rabdosichuanin C (7), beta-sitosterol (8), ursolic acid (9), 2alpha-hydroxyursolic acid (10), maslinic acid ( 11 ), 2alpha,3alpha,19-trihydroxy-urs-12-en-28-oicacid (12), and daucosterol (13). CONCLUSION: Except for compounds 5, 8, 9 and 13, the remaining compounds were found in R. excisa for the first time.