DPPH radical scavenging experiments were used to evaluate proton donating antioxidant effects; it was exposed that compound 7c has the most significant antioxidant activity, while less than the standard ascorbic acid. Finally, HOMO-LUMO was calculated, which represents the quantum mechanical calculations of energies and conducted by the theory of density functional (DFT) method based on the level of (B3LYP) with 6-31G (d, p) basis set.