131410-48-5 Gadolinium, (5,8-bis((carboxy-kappaO)methyl)-11-(2-(methylamino)-2-(oxo-kappaO)ethyl)-3-(oxo-kappaO)-2,5,8,11-tetraazatridecan-13-oato(3-)-kappaN5,kappaN8,kappaN11,kappaO13)-