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Wenger, R. M.; Martin, K.; Timbers, C.; Tromelin, A. Structure of Cyclosporine and Its Metabolites: Total Synthesis of Cyclosporine Metabolites Formed by Oxidation at Positions 4 and 9 of Cyclosporine. Preparation of Leucine-4-Cyclosporine, (γ-Hydroxy)-N-Methyl-Leucine-9-Cyclosporine and Leucine-4-(γ-Hydroxy)-N-Methyl-Leucine-9-Cyclosporine. Chimia 1992, 46, 314.