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Abstract

Poly(amino acid) derivatives, which are chelating agents of paramagnetic metal ions, in which at least 3 of the donor nitrogen atoms carry identical or different substituents, of formula CH(R.sub.1)--X, in which X represents CO.sub.2 R.sub.a, CONR.sub.b R.sub.c or P(R.sub.d)O.sub.2 H and R.sub.a, R.sub.b and R.sub.c, which are identical or different, represent H or optionally hydroxylated (C.sub.1 -C.sub.8)alkyl, R.sub.d represents OH, (C.sub.1 -C.sub.8)alkyl or (C.sub.1 -C.sub.8)alkoxy and R.sub.1 represents a hydrophilic group with a molecular weight greater than 200 containing at least 3 oxygen atoms, with the proviso that at least 3 of the X groups are optionally salified acid functional groups.

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