1.13.11.9 2,5-DHP dioxygenase, 2,5-dihydroxypyridine dioxygenase, 2,5-dihydroxypyridine oxygenase, 2,5DHP dioxygenase, NicX, NicX protein, oxygenase, 2,5-dihydroxypyridine 5,6-di-, pyridine-2,5-diol dioxygenase - -, 700940, 710759, 742294, 763873, 764843, 765451 1.13.11.9 EC 1.13.1.9 formerly -