gadolinium(+3) cation

iotroxic acid meglumine salt

2-[2-[carboxylatomethyl-[2-(carboxylatomethyl-(carboxymethyl)amino)ethyl]amino]ethyl-(carboxymethyl)amino]acetate

3-[[2-[2-[2-[(3-carboxy-2,4,6-triiodo-phenyl)carbamoylmethoxy]ethoxy]ethoxy]acetyl]amino]-2,4,6-triiodo-benzoic acid