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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.
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Seguenı et al. (2011) studied this question.
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