OXIDOREDUCTASE, BETA BARREL, TIM BARREL, FAD, FLAVOPROTEIN, MEMBRANE, MITOCHONDRION, MITOCHONDRION INNER MEMBRANE, POLYMORPHISM, PYRIMIDINE BIOSYNTHESIS, TRANSIT PEPTIDE 3G0X HUMAN DIHYDROOROTATE DEHYDROGENASE IN COMPLEX WITH A LEFLUNOMIDE DERIVATIVE INHIBITOR 5