gadoteridol [ Altana Pharma brand of gadoteridol,Gd(DO3A),Gd-HP-DO3A,Gd-HPDO3A,GdHPDO3A,Prohance,Rovi brand of gadoteridol,gadolinium 1,4,7-triscarboxymethyl-1,4,7,10-tetraazacyclododecane ] nonionic magnetic resonance contrast agent; structure given in first source