Tyropanoic acid

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Tyropanoic acid
CAS number 27293-82-9 YesY
PubChem 5611
ATC code V08AC09
Jmol-3D images Image 1
Molecular formula C15H18I3NO3
Molar mass 641.02 g/mol
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Tyropanoic acid and its salt sodium tyropanoate are radiocontrast agents used in cholecystography (X-ray diagnosis of gallstones). Trade names include Bilopaque, Lumopaque, Tyropaque, and Bilopac.[1] The molecule contains three heavy iodine atoms which obstruct X-rays in the same way as the calcium in bones to produce a visible image. After injection it is rapidly excreted into the bile.[2]


  1. ^ "PubChem CID 5611". 
  2. ^ "Inhibition of hepatic binding of thyroxine by cholecystographic agents". J. Clin. Invest. 65 (5): 1032–40. May 1980. doi:10.1172/JCI109755. PMC 371433. PMID 7364937.