1,1-Diphenyl-2-picrylhydrazyl Free Radical (contains 10-20% Benzene) Cas 1898-66-4 Formula C18H12N5O6 Weight 394.32 Aliases 1,1-Diphenyl-2-picrylhydrazyl radical 2,2-Diphenyl-1-(2,4,6-trinitrophenyl)hydrazyl DPPH Purity≥97.0%(HPLC) Benzene10.0-20.0% Meltingpoint138°C-144°C