dimethyl (3a'R,3b'R,4'R,4a'S,5'R,5a'S)-5'-acetamidohexahydrospiro[cyclohexane-1,2'-cyclopropa[3,4]cyclopenta[1,2-d][1,3]dioxole]-4',5'-dicarboxylate

ethyl (1R,5S,6S)-4-oxobicyclo[3.1.0]hex-2-ene-6-carboxylate

ethyl (1S,5R,6S)-spiro[bicyclo[3.1.0]hexane-2,2'-[1,3]dioxolan]-3-ene-6-carboxylate

dimethyl (1S,2S,5R,6S)-2-acetamidobicyclo[3.1.0]hexane-2,6-dicarboxylate

(1S,2S,5R,6S)-2-amino-6-(methoxycarbonyl)bicyclo[3.1.0]hexane-2-carboxylic acid