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Köhn RD, Seifert G, Pan Z, Mahon MF, Kociok-Köhn G.Köhn RD, et al.Angew Chem Int Ed Engl. 2003 Feb 17;42(7):793-6. doi: 10.1002/anie.200390210.Angew Chem Int Ed Engl. 2003.PMID: 12596202No abstract available.