ChEBI: Dihydroorotic acid is a pyrimidinemonocarboxylic acid that results from the base-catalysed cyclisation of N(alpha)-carbethoxyasparagine. It is a secondary amide, a monocarboxylic acid, a pyrimidinemonocarboxylic acid and a N-acylurea. It is functionally related to an orotic acid. It is a conjugate acid of a dihydroorotate.