1,4,7,10-Tetraazacyclododecane-1,4,7,10-tetraacetic acid; 2-[4,7,10-tris(carboxymethyl)-1,4,7,10-tetrazacyclododec-1-yl]acetic acid; 2,2',2'',2'''-(1,4,7,10-Tetraazacyclododecane-1,4,7,10-tetrayl)tetraacetic Acid; 1,4,7,10-Tetra(carboxymethyl)-1,4,7,10-tetraazacyclododecane; 1,4,7,10-Tetraazacyclododecane-N,N',N'',N'''-tetraacetic Acid; Tetraxetan; Gadobutrol Impurity 9