摘要: A composition comprising the regioisomer of 2- (p-isothiocyanatobenzyl) -6-metildietilentriamino- N, N, N''N '', N '' '- pentaacetic (MX-DTPA) of formula (I): (see formula) in which the percentage of said regioisomer, relative to any other regioisomer, is at least 90%....