(3R,5R)-1-(tert-butoxycarbonyl)-3-(tert-butyldimethylsiloxy)methyl-5-benzyloxycarbonyl-pyrrolidin-2-one

(2R,4S)-4-Hydroxymethyl-pyrrolidine-1,2-dicarboxylic acid 2-benzyl ester 1-tert-butyl ester

(2R)-N-methoxy-N-methyl-2-(t-butyldiphenylsilyloxy)propanamide

(R)-2-(tert-butyldiphenylsiloxy)-6-hepten-3-one

(2S,9R)-9-(tert-butyldiphenylsiloxy)-8-oxo-2-(tert-butoxycarbonyl)-amino-4-decenoic acid benzyl ester