A new flavone derivative named desmodol was isolated together with N, N-dimethyltryptamine, bufotenine and bufotenine N-oxide from the roots and stems of Desmodium caudatum DC. The structure of desmodol was presented to be 5-hydroxy-6-methyl-8, 8-dimethyl-2-(3, 4-dihydroxyphenyl)-4H, 8H-benzo [1, 2-b : 3, 4-b'] dipyran-4-one (5, 3', 4'-trihydroxy-6-methyl-8, 8-dimethylpyrano (2, 3-h)-flavone)...