Ornithuric acid

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Structural formula
L-ornithuric acid
Surname Ornithuric acid
other names
  • Dibenzoylornithine
  • 2,5-dibenzamidopentanoic acid
  • N 2 , N 5 -dibenzoyl- L- ornithine
  • Dibenzoylamidovaleric acid
Molecular formula C 19 H 20 N 2 O 4
Brief description

colorless needles

External identifiers / databases
CAS number 495-46-5
PubChem 184849
ChemSpider 160712
Wikidata Q2031298
Molar mass 340.37 g mol −1
Physical state


Melting point

189 ° C


poorly soluble in water

safety instructions
GHS hazard labeling
no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Ornithuric acid , also known as dibenzoylornithine, is an excretion product in birds that is used to detoxify benzoic acid . It is synthesized from the amino acid L - ornithine and two molecules of benzoic acid.


The compound was discovered by Charles Upham Shepard in the mid-19th century , but mistaken for a different acid. In 1877 it was examined more closely by Max Jaffé .

Individual evidence

  1. a b c d August Kekulé, Richard Anschütz, Gustav Schultz, Wilhelm LaCoste: Textbook of organic chemistry . 1867, p. 447 ( limited preview in Google Book search).
  2. Entry on l-ornithine. In: Römpp Online . Georg Thieme Verlag, accessed on June 20, 2014.
  3. This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
  4. ^ Heinz Penzlin: Textbook of Animal Physiology. 5th edition. Gustav Fischer Verlag, Jena 1991, ISBN 3-334-60363-6 .
  5. Zeitschrift für rational Medicin, Volume 3, 1868, limited preview in the Google book search.