4-[(4-bromo-5-ethyl-1-methylpyrazol-3-yl)diazenyl]-3-ethyl-N,N,5-trimethylaniline;6-chloro-4-[[5-(hydroperoxymethyl)-1-(2-methoxyethyl)pyrazol-3-yl]diazenyl]-N,N,2,3-tetramethylaniline;ethyl 3-[[4-(diethylamino)-3-ethoxy-2,5-diethyl-6-methylphenyl]diazenyl]-5-methyl-1-prop-2-enylpyrazole-4-carboxylate;N-ethyl-4-[[1-(2-hydroperoxyethyl)pyrazol-3-yl]diazenyl]-N,2,3,5,6-pentamethylaniline;1-ethyl-3-[(5-methoxy-2-methyl-4-piperidin-1-ylphenyl)diazenyl]pyrazole-4-carbonitrile;1-methyl-3-[(1,2,3,3,6-pentamethyl-2H-indol-5-yl)diazenyl]pyrazole-4-carbonitrile