(3R,4S,5R)-ethyl 5-acetylamino-4-hydroxy-3-(pentan-3-yloxy)cyclohex-1-enecarboxylate

(3R,4S,5R)-ethyl 5-acetylamino-4-methanesulfonyloxy-3-(pentan-3-yloxy)cyclohex-1-enecarboxylate

ethyl (3R,4R,5R)-4,5-acetylimino-3-(1-ethylpropoxy)cyclohex-1-ene-1-carboxylate

(1S,5R,6S)-7-(diethoxy-phosphoryl)-5-methanesulfonyloxy-7-aza-bicyclo[4.1.0]hept-2-ene-3-carboxylic acid ethyl ester

(3R,4S,5R)-4-[(diethoxyphosphoryl)amino]-3-(1-ethylpropoxy)-5-(methanesulfonyloxy)cyclohex-1-enecarboxylic acid ethyl ester