Orotidine is a nucleoside formed by attaching orotic acid to a ribose ring via a β-N₁-glycosidic bond. It is found in bacteria, fungi and plants. It was first isolated in 1951 from the fungus Neurospora by A. Michael Michelson, William Drell, and Herschel K. Mitchell.^[1] In humans, orotidine occurs as its 5'-phosphate (orotidylic acid), which is an intermediate in pyrimidine nucleotide biosynthesis (cytidine and uridine) that are found in nucleic acids. Orotidine itself is not a component of nucleic acid. Large amounts of orotidine are excreted in the urine of cancer patients treated with 6-azauridine.

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Orotidine

Names
IUPAC name 2,6-Dioxo-3-(β-D-ribofuranosyl)-1,2,3,6-tetrahydropyrimidine-4-carboxylic acid
Systematic IUPAC name 3-[(2R,3R,4S,5R)-3,4-Dihydroxy-6-(hydroxymethyl)oxolan-2-yl]-2,6-dioxo-1,2,3,6-tetrahydropyrimidine-4-carboxylic acid
Other names 3-Ribofuranosylorotic acid, 6-Carboxyuridine, orotate riboside
Identifiers
CAS Number	314-50-1 Y
3D model (JSmol)	Interactive image
ChemSpider	83729 Y
PubChem CID	92751
UNII	B350MC02GZ Y
CompTox Dashboard (EPA)	DTXSID90953435
InChI InChI=1S/C10H12N2O8/c13-2-4-6(15)7(16)8(20-4)12-3(9(17)18)1-5(14)11-10(12)19/h1,4,6-8,13,15-16H,2H2,(H,17,18)(H,11,14,19)/t4-,6-,7-,8-/m1/s1 Y Key: FKCRAVPPBFWEJD-XVFCMESISA-N Y
SMILES O=C(O)C=1N(C(=O)NC(=O)C=1)[C@@H]2O[C@@H]([C@@H](O)[C@H]2O)CO
Properties
Chemical formula	C10H12N2O8
Molar mass	288.213 g/mol
Melting point	200 °C (392 °F; 473 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

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The symbol commonly used for orotidine is O or Ord.