tert-butyl (2S,5S,6S)-2-benzyloxymethyl-6-[(1E,3R)-3-hydroxynon-1-enyl]-1-azaspiro[4.5]decane-1-carboxylate

(S)-5-benzyloxymetyl-1-tert-butoxycarbonyl-2-pyrrolidinone

tert-butyl (1S)-[(9E,11E)-1-benzyloxymethyl-4-oxo-9,11-octadecadienyl]carbamate

tert-butyl (2S,5S,6S)-2-benzyloxymethyl-6-[(1E)-3-oxonon-1-enyl]-1-azaspiro[4.5]decane-1-carboxylate

tert-butyl (2S,5S,6S)-2-benzyloxymethyl-6-[(1E,3S/R)-3-hydroxynon-1-enyl]-1-azaspiro[4.5]decane-1-carboxylate