label: 4-carboxy-2-hydroxymuconate semialdehyde hemiacetal dehydrogenase activity
label_lc: 4-carboxy-2-hydroxymuconate semialdehyde hemiacetal dehydrogenase activity
description: "Catalysis of the reaction: 4-carboxy-2-hydroxymuconate semialdehyde hemiacetal + NADP+ = 2-oxo-2H-pyran-4,6-dicarboxylate + H+ + NADPH."