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L. Sous-atmosphère-inerte, 58 mmol) en solution dans 60 mL de CHCl 3 est réduit en présence de dithioérythritol (3,0 g ? 19,45 mmol) et de triéthylamine Après agitation à température ambiante pendant 2h, le milieu est lavé par une solution aqueuse d'acide citrique 5% (3 x 50 mL) puis par H 2 O (saturées en N 2 ). La phase organique résultante est séchée sur MgSO 4 puis concentrée sous vide, Le résidu est solubilisé dans 30 mL de MeOH et cristallisé à -20°C. Après un lavage au MeOH froid et séchage sous vide, on obtient le Pal-Cys-OtBu, pp.202-205

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