Complexes of chelating ligands derived from gadolinium and diastereomerically enriched PCTA, and processes for preparation and purification

摘要

The present invention relates to a complex having the formula (II), which consists of a diastereomeric excess of at least 90% comprising a mixture of isomers II-RRR and II-SSS having the formulas II-RRR and II-SSS: [Formula II-SSS] [Formula II-RRR] . The present invention also relates to a process for preparing and purifying said complex of formula II and to a composition comprising said complex.