2-[2-[2-[Bis(carboxylatomethyl)amino]ethyl-(carboxymethyl)amino]ethyl-(carboxymethyl)amino]acetate;gadolinium(3+)
A complex of gadolinium with a chelating agent, diethylenetriamine penta-acetic acid (DTPA see PENTETIC ACID), that is given to enhance the image in cranial and spinal MRIs. (From Martindale, The Extra Pharmacopoeia, 30th ed, p706)