Two new pyranoflavanones, 2''',3'''-epoxylupinifolin and dereticulatin
, together with the known flavonoid lupinifolin, were identified from
the stems of Derris reticulata. The structures and NMR spectral data w
ere assigned by the use of 2D NMR technology and chemical transformati
ons. All of the isolates showed cytotoxic activity in the P-388 cell l
ine. (C) 1997 Elsevier Science Ltd.