(S)-dihydroorotate + ubiquinone-8 <=> ubiquinol-8 + orotate
(s)-dihydroorotate + ubiquinone-8 <=> ubiquinol-8 + orotate
(S)-dihydroorotate + ubiquinone-8 <=> ubiquinol-8 + orotate
(s)-dihydroorotate + ubiquinone-8 <=> ubiquinol-8 + orotate