This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-CH group of donor with oxygen as acceptor. The systematic name of this enzyme class is 5,6-dihydrouracil:oxygen oxidoreductase. It employs one cofactor, FMN.
Owaki J, Uzura K, Minami Z and Kusai K (1986). "Partial-purification and characterization of dihydrouracil oxidase, a flavoprotein from Rhodotorula glutinis". J. Ferment. Technol.64 (3): 205–210. doi:10.1016/0385-6380(86)90100-7.