Flavonoids from Algerian propolis

Abstract The investigation of propolis collected from Jijel, located in the northern-east part from Algeria afforded five flavones: pectolinarigenin ( 1 ), pilosin ( 2 ), ladanein ( 3 ), Chrysin ( 4 ) and apigenin ( 5 ). The structures were elucidated by spectroscopic analysis, including mass spectrometry, 1D and 2D NMR.