Herstellung enantiomerenreiner cis‐ oder trans‐konfigurierter 2‐(tert‐Butyl)‐3‐methylimidazolidin‐4‐one aus den Aminosäuren (S)‐Alanin, (S)‐Phenylalanin, (R)‐Phenylglycin, (S)‐Methionin und (S)‐Valin

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