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Five psoralen derivatives were synthesized and the structures of them were characterized by 1H‐NMR, 13C‐NMR, and IR. The antioxidant properties of the compounds were tested by inhibiting the free radical‐initiated DNA oxidation and scavenging the radical reaction. The results showed that the effective stoichiometric factors (n) of the compounds V and IV could reach 2.00 and 2.11 in the system of inhibiting...