Compounds containing a magnetic core type SPIO, especially for use in magnetic resonance imaging (MRI) as negative contrast agents based on iron oxide, whose principle consists in that it is composed of a core of iron oxide formed nestechiometrickým super paramagnetic Fe.sub.3.nOsub. 4.na the surface skin composed of two amino-tereftalovou acid (ATA) or terephthalic acid (TA).
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