Boc-L-羟脯氨酸

(2S,4S)-1-(3,3-dimethylbutoxycarbonyl)-4-hydroxypyrrolidine-2-carboxylate

ethyl (4S)-N-tert-butyloxycarbonyl-4-tert-butyldiphenylsiloxy-α,β-didehydroprolinate

ethyl (4S)-2-(N-tert-butyloxycarbonylamino)-4-tert-butyldiphenylsiloxy-5-hydroxy-2-pentenoate

ethyl (4S)-2-(N-tert-butyloxycarbonylamino)-5-tert-butyldimethylsiloxy-4-tert-butyldiphenylsiloxy-2-pentenoate