Synthesis of cyclosporine. Part II. Synthesis of Boc-D-Ala-MeLeu-MeLeu-MeVal-OH, a part of the peptide sequence of cyclosporine, by different strategic ways and synthesis of its isomers Boc-D-Ala-MeLeu-D-MeLeu-MeVal-OH, Boc-D-Ala-Meleu-D-MeLeu-D-MeVal-OH,

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