Novel Bibenzyl Derivatives from the Tubers of Bletilla striata

Abstract Three novel bibenzyl derivatives, blestritins A–C ( 1 – 3 ), along with 18 known constituents, were isolated from the tubers of Bletilla striata (Orchidaceae), a traditional Chinese medicine used for the treatment of tuberculosis and haemorrhage of the stomach and lungs. Their structures were identified on the basis of spectroscopic analyses.