Bai, L; Yamaki, M; Takagi, S
From tubers of Pleione bulbocodioides, two flavan-3-ols and two stilbenoids (shanciols A-D) were isolated, together with the known compounds, bletilols A and C. The new structures were elucidated to be 4'-hydroxy- 3',5',7-trimethoxy-5-(3''-hydroxyphenethyl)flavan-3-ol, 4'-hydroxy-3',7- dimethoxy-5-(3''-hydroxyphenethyl)flavan-3-ol, 4-hydroxy-11-methoxy-3-(4'- hydroxy-3',5'-dimethoxyphenyl)-3,4,5,6-tetrahydro-2H-phenanthro[2,1-b] pyran- 8-ol and 4-hydroxy-6-methoxy-3-(4'-hydroxy-3',5'-dimethoxyphenyl)-3,4,10,11- tetrahydro-2H-phenanthro[2,3-b]pyran-8-ol, respectively, on the basis of spectroscopic data and chemical correlations.