A new prenylated flavone, 3,5,7,3'-tetrahydroxy-8,4'-dimethoxy-6-(3-methylbut-2- enyl)flavone (1), together with three known flavone derivatives (2-4), two known dihydrophenanthrenes (5-6), two known lignin derivatives (7-8), and three known phenolic glycoside compounds (9-11) were isolated from the
Four new pyrrolidone substituted bibenzyls, dusuanlansins A-D (1-4) were isolated from the pseudo bulbs of Pleione bulbocodioides, along with 19 known compounds (5-23). Compounds 1-4 are two pairs of epimers of pyrrolidone substituted bibenzyls, which were separated successfully by a Chiralcel OD-RH