[EN] 1 , 4 -BIS (CARBOXYMETHYL) -6- ' BIS ( CARBOXYMETHYL) AMINO ! -6 -METHYL- PERHYDRO-1 , 4 DIAZEPINE (AAZTA) DERIVATIVES AS LIGANDS IN HIGH RELAXIVITY CONTRAST AGENTS FOR USE IN MAGNETIC RESONANCE IMAGING (MRI )<br/>[FR] AGENTS DE CONTRASTE A RELAXIVITE ACCRUE