(3R,4R,5R)-3-Butyl-4,5-dihydroxy-cyclohex-1-enecarboxylic acid methyl ester

(1R,5R,6S)-5-Butyl-7-aza-bicyclo[4.1.0]hept-3-ene-3-carboxylic acid methyl ester

(1S,5R,6R)-5-Butyl-7-oxa-bicyclo[4.1.0]hept-3-ene-3-carboxylic acid methyl ester

(3R,4S,5S)-4-Amino-5-azido-3-butyl-cyclohex-1-enecarboxylic acid methyl ester

(3R,4S,5S)-4-Acetylamino-5-amino-3-butyl-cyclohex-1-enecarboxylic acid methyl ester