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Two new bibenzyls ( 1  and  2 ) were isolated from the pseudobulbs of  Pleione grandiflora  (Rolfe) Rolfe along with six known compounds, including isoarundinin I ( 3 ), isoarundinin II ( 4 ), bulbocodin D ( 5 ), batatasin III ( 6 ), 5,3'-dihydroxy- 4-( p -hydroxybenzyl)-3-methoxybibenzyl ( 7 ) and shancigusin F ( 8 ). Their structures were established on the basis of spectroscopic methods. These compounds showed potent DPPH free radical scavenging effects with IC 50  values ranging from 49.72 ± 0.35 μM to 65.41 ± 0.49 μM.

Two new bibenzyls from Pleione grandiflora (Rolfe) Rolfe and their antioxidant activity