sentences:  Dihydroorotase
  
  Dihydroorotase (, "carbamoylaspartic dehydrase", "dihydroorotate hydrolase") is an enzyme which converts carbamoyl aspartic acid into 4,5-dihydroorotic acid in the biosynthesis of pyrimidines.It forms a multifunctional enzyme with carbamoyl phosphate synthetase and aspartate transcarboymalase.