(E)-2-((1S,3'R)-3'-phenylhexahydrospiro[cyclopentane-1,5'-oxazolo[3,2-a]pyridin]-2-ylidene)acetonitrile

(1R,3'R)-3'-phenylhexahydrospiro[cyclopentane-1,5'-oxazolo[3,2-a]pyridin]-2-one

6-phenyl-2,3,5,6,9,10-hexahydro-1H-4-oxa-6a-azacyclopenta[d]naphthalen-3a-ylamine

[(5S,7S)-1-[1-Cyano-meth-(E)-ylidene]-6-((R)-2-hydroxy-1-phenyl-ethyl)-6-aza-spiro[4.5]dec-7-yl]-acetic acid ethyl ester

{(5S,7S)-6-[(R)-2-(tert-Butyl-dimethyl-silanyloxy)-1-phenyl-ethyl]-1-[1-cyano-meth-(E)-ylidene]-6-aza-spiro[4.5]dec-7-yl}-acetic acid ethyl ester