Abstract: Investigation of the chemical constituents of the leaves of Craibiodendron yunnanense obtained the isolation of fifteen compounds . Their structures were elucidated as asebotoxin-III ( 1) , grayanotoxin-XVIII (2) , leucothol A ( 3) , proA-4 (4) , quercetin-3-O-β-galactoside ( 5) , quercetin-3-O-α- arabinofuranoside (6) , quercetin-3-O-α-rhamnopyranoside (7) , trihydroxyflavone-3-O-α-rhamnopyranoside (8 ) , 2 , 4-bis ( 4-hydroxyphengl )-1 , 3- cyclobutane dicarboxglic aicd ( 9 ) , ( Z )-p-hydroxy cinamic acid (10) , ( E )-p-hydroxy cinamic acid (11) , vanillic acid ( 12 ) , 2α, 3β-dihydroxyurs-5 , 12-dien-28-oic acid ( 13 ) , 2α, 3β, 23-trihydroxyurs-12- en-28-oic acid (14) , andβ-stiosterol (15) . Compounds 1 - 4 , and 8 - 14 were isolated from the titled plant for the first time . In addition , compounds 1 - 3 may have closed relationships with the effects of analgesic .

Key words: Craibiodendron yunnanense