. "\"Catalysis of the reaction: (S)-dihydroorotate + NAD(+) = H(+) + NADH + orotate.\" [EC:1.3.1.14, RHEA:13516]" . . "orotate reductase (NADH) activity" . "(S)-dihydroorotate:NAD+ oxidoreductase activity" . "EC:1.3.1.14" . "KEGG:R01869" . "MetaCyc:OROTATE-REDUCTASE-NADH-RXN" . "RHEA:13516" . .