iocetamic acid iocetamic acid iocetamic acid (trade name cholebrin) is a pharmaceutical drug taken by mouth and used as an iodinated contrast medium for x-ray imaging of the gall bladder. iocetamic acidclinical datatrade namescholebrinroutes ofadministrationby mouthatc codev08ac07 (who) identifiers iupac name 3--2-methylpropanoic acid cas number16034-77-8pubchem cid27648drugbankdb09403chemspider25724uniifa675q0e3ekeggd04563chemblchembl1200770comptox dashboard (epa)dtxsid2023149 echa infocard100.036.505 chemical and physical dataformulac12h13i3n2o3molar mass613.960 g·mol−13d model (jsmol)interactive image smiles o=c(o)c(cn(c(=o)c)c1c(i)cc(i)c(c1i)n)c it is not known to be marketed anywhere in the world in 2021.