label: dihydropyrimidine dehydrogenase (NAD+) activity
label_lc: dihydropyrimidine dehydrogenase (nad+) activity
description: "Catalysis of the reaction: a 5,6-dihydropyrimidine (5,6-dihydrouracil or 5,6-dihydrothymine) + NAD+ = a pyrimidine (uracil or thymine) + NADH + H+."