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In this work, an attempt to identify the flavonoid content of the Libyan Onosma Cyrenaicum led to the isolation of three flavonoids 7,8-dihydroxy-2-(4-hydroxyphenyl)-4H-chromen-4-one(GE-001), 5,7-dihydroxy-2-(3-hydroxy-4-methoxy phenyl)-4H-chromen-4-one (GE-002) and 5,7-dihydroxy-3-(4-hydroxyphenyl)-4H-chromen-4-one (GE-003), the isolated compounds were characterized using 1H and 13C-NMR techniques. A further DFT study at ωB97-XD with 6-311++G** basis set in water was conducted to calculate the isolated compounds' global and local reacti
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