7,8-dihydroxykynurenate + O2 <=> 5-(3-carboxy-3-oxoprop-1-en-1-yl)-4,6-dihydroxypyridine-2-carboxylate + H(+)
7,8-dihydroxykynurenate + o2 <=> 5-(3-carboxy-3-oxoprop-1-en-1-yl)-4,6-dihydroxypyridine-2-carboxylate + h(+)