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Gd(III) complexes of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid bearing two and four hydroxymethyl moieties on the cyclen ring were prepared to be studied as low toxicity MRI contrast agents. The key intermediates in the syntheses of the two ligands are the corresponding bis and tetrasubstituted cyclen derivatives. Bis(hydroxymetyl)cyclen was obtained according the so-called ‘crab-like’...
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