[EN] PROCESS FOR THE PREPARATION OF 2,2',2''-(10-((2R,3S)-1,3,4-TRIHYDROXY BUTAN-2-YL)-1,4,7,10-TETRAAZACYCLODODECANE-1,4,7-TRIYL) TRIACETIC ACID AND ITS COMPLEXES [FR] PROCÉDÉ DE PRÉPARATION D'ACIDE 2,2',2''-(10-((2R,3S)-1,3,4-TRIHYDROXY BUTAN-2-YL)-1,4,7,10-TÉTRAAZACYCLODODÉCANE-1,4,7-TRIYL) TRIACÉTIQUE ET DE SES COMPLEXES
The invention concerns a process for the preparation of the calcium complex of 0-(2,3-Dihydroxy-1-(hydroxymethyl)propyl)-1,4,7,10-tetraazacyclodecane-4,7-triacetic acid, also known as Calcobutrol, starting from the pure gadolinium complex (Gadobutrol). The invention furthermore concerns Calcobutrol with a hitherto unknown level of purity.