ethyl (3R,4R,5S)-5-N,N-diallylamino-4-(1,1-dimethylethyl)amino-3-(1-ethylpropoxy)-1-cyclohexene-1-carboxylate

ethyl (3R,4R,5S)-4-N-acetyl(1,1-dimethylethyl)amino-5-N,N-diallylamino-3-(1-ethylpropoxy)-1-cyclohexene-1-carboxylate

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

ethyl (3R,4S,5R)-5-N-(1,1-dimethylethyl)amino-3-(1-ethylpropoxy)-4-hydroxy-1-cyclohexene-1-carboxylate

(3R,4S,5R)-3,4,5-tris-methanesulfonyloxy-cyclohex-1-enecarboxylic acid ethyl ester