[Studies on the chemical constituents of Pseudotsuga sinensis].

Aim: To study the chemical constituents of Pseudotsuga sinensis Dode (Pinaceae).

Methods: To separate the constituents of P. sinensis by using various kinds of chromatography and identify their structures on the basis of spectral analysis.

Results: Six compounds were isolated from P. sinensis. Their structures were established as 5,7,4'-trihydroxy-6-methylflavanone (poriol, I), 3,5,7,3',4'- pentahydroxyflavonone (quercetin, II), 5,7,3',5'-tetrahydroxy-6- methylflavanone (III), 5,7,3',5'-tetrahydroxyflavanone (IV), 3,5,7,3',5'-pentahydroxyflavanone (V) and 5-hydroxy-6-methylchromone-7-O-beta-D-glucopyranoside (VI) based on the analysis of spectral data of IR, UV, MS, 1D and 2D-NMR.

Conclusion: Compounds III and VI are new compounds. All of six compounds were isolated from this plant for the first time.