D-(αMe)Pro amide

(2R,5R)-2-Methyl-5-phenylsulfanyl-pyrrolidine-1,2-dicarboxylic acid dimethyl ester

(2R,5R)-tert-butyl 2-(tert-butyl)-5-(3-chloropropyl)-3,5-dimethyl-4-oxoimidazolidine-1-carboxylate