Marine Streptomyces Sp. VITMK1 Derived Pyrrolo [1, 2-A] Pyrazine-1, 4-Dione, Hexahydro-3-(2-Methylpropyl) and Its Free Radical Scavenging Activity

Fig. (4) DPPH radical scavenging activity of the diketopiperazine compound extracted from Streptomyces sp. VITMK1.