tert-butyl (2S)-2-aminochloranuidylheptanoate;tert-butyl (2S,4R)-4-methyl-2-[(3R)-3-[(2-methylpropan-2-yl)oxycarbonyl]octanoyl]pyrrolidine-1-carboxylate;bis((2S,4R)-4-methyl-1-[(2-methylpropan-2-yl)oxycarbonyl]pyrrolidine-2-carboxylic acid)