(1R,4S,4'R,5'R)-methyl 4',5'-diphenyl-7-azaspiro[bicyclo[2.2.1]heptane-2,2'-[1,3]dioxolane]-7-carboxylate

meso-N-methoxycarbonyl-2,3-bis(phenylsulfonyl)-7-azabicyclo[2.2.1]hept-2-ene

(1R,3S,4S,4'R,5'R)-methyl 4',5'-diphenyl-3-(phenylsulfonyl)-7-azaspiro[bicyclo[2.2.1]heptane-2,2'-[1,3]dioxolane]-7-carboxylate

(3aR,5S,7aS)-2,2-dimethylhexahydrobenzo[d][1,3]dioxol-5-yl methanesulfonate

(3aR,5R,7aS)-2,2-dimethylhexahydrobenzo[d][1,3]dioxol-5-yl methanesulfonate