3.1.6.1 0.001 - sulfate at 10 mM 4-nitrocatechol sulfate 693036 3.1.6.1 0.05 - phosphate at 10 mM 4-nitrocatechol sulfate 693036 3.1.6.1 2.4 - phosphate pH 4.6, 37°C 730022 3.1.6.1 2.9 - sulfate pH 4.6, 37°C 730022