. . . . . . "Hiroshi Sugano, Ryuichi Ishida, Michio Yamamura, \"Dihydroorotic acid derivative and processes for preparing the same.\" U.S. Patent US4665056, issued April, 1981."@en . "Dihydroorotic Acid"@en . . . . . . . . . . . . . . . . . . . . . . . "155-54-4"@en . . . . "experimental"@en . . . . .