2.1.1.13 0.017 - 4-nitro-2,1,3-benzothiadiazole in 50 mM phosphate buffer, pH 7.4, at 37°C 673596 2.1.1.13 0.026 - 2-nitro-1H-benzimidazole in 50 mM phosphate buffer, pH 7.4, at 37°C 673596