<unk>  and its salt sodium tyropanoate are radiocontrast agents used in cholecystography (X-ray diagnosis of gallstones).  Trade names include Bilopaque, Lumopaque, Tyropaque, and Bilopac.  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.
Tyropanoic acid
Iopanoic acid
Gamma-Linolenic acid
Choline
Meconic acid
Sardine
Cyanic acid
Arachidonic acid