Gadobutrol Impurity 1 Catalogue G210501 CAS 72573-82-1 M.W 404.42(free base),558.65 M.F C16H28N4O8.Gd Specifications FAQs 2,2',2''-(10-(carboxymethyl)-1,4,7,10-tetraazacyclododecane-1,4,7-triyl) triacetate Gd3