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Antioxidants and oxidative stress play a critical role in cardiovascular diseases.Danhong injection (DHI) is a well prescribed cardiovascular medication in China, but its detailed chemical basis and mechanisms of action remain unknown.To prove the antioxidant activity of DHI, its free radical scavenging capacity (RSC) was assessed by 2,2-diphenyl-1-picrylhydrazyl (DPPH) spectrophotometric assay.