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Two new sesquiterpenoids-13-hydroxycurzerenone ( 1 ) and 1-oxocurzerenone ( 2 )-have been isolated from the rhizomes of Curcuma zedoaria , together with 13 known compounds ( 3 - 15 ). The structures of two new compounds were determined through spectroscopic and MS analyses. Among the isolated compounds, 13-hydroxycurzerenone ( 1 ), 1-oxocurzerenone ( 2 ), curzerenone ( 3 ), germacrone ( 4 ), curcolone ( 5 ), procurcumenol ( 6 ), ermanin ( 7 ), curcumin ( 8 ), and a mixture of stigmast-4-en-3,6-dione ( 12 ) and stigmasta-4,22-dien-3,6-dione ( 13 ) exhibited inhibition (with inhibition % in the range of 21.28%-67.58%) against collagen-induced platelet aggregation at 100 μM. Compounds 1 , 5 , 7 , 8 , and the mixture of 12 and 13 inhibited arachidonic acid (AA)-induced platelet aggregation at 100 μM with inhibition % in the range of 23.44%-95.36%.

New Sesquiterpenoids and Anti-Platelet Aggregation Constituents from the Rhizomes of Curcuma zedoaria