Fluorine-18-labelled maleimide compounds of general formula (I):
##STR00001## in which: m represents an integer from 0 to 10; n
represents an integer from 1 to 10; Y represents a group selected from
optionally substituted monocyclic or bicyclic heterocyclic groups; X
represents a radical of formula:
(U).sub.a--((CR.sub.1R.sub.2).sub.b--(V).sub.c).sub.d--((CR.sub.3R.sub.4)-
.sub.e--(W).sub.f).sub.g-- in which: a, b, c, d, e, f and g represent
each independently an integer from 0 to 10; U, V and W represent each
independently --NR.sub.1--, --O--, --S--, ##STR00002## ethynyl,
--CR.sub.1.dbd.CR.sub.2--, --(C.dbd.O)--, --(C.dbd.S)--,
--C(.dbd.NR.sub.1)--, --C(.dbd.O)O--, --(C.dbd.S)S--,
--C(.dbd.NR.sub.1)NR.sub.2--, --CR.sub.1R.sub.2--, --CR.sub.1OR.sub.2--
or --CR.sub.1NR.sub.2R.sub.3--. Process for preparing these compounds;
their use for labelling macromolecules, and complexes of these compounds
with a macromolecule.Detection and analysis kit, or diagnosis kit,
comprising the said complexes.Use of the complexes in a medical imaging
process such as positron emission tomography (PET).
