tert-butyl (3aR,4R,5R,6R,7R,7aS)-5-hydroxy-2,2-dimethyl-6-(phenylsulfonyl)hexahydro-4,7-epiminobenzo[d][1,3]dioxole-8-carboxylate

(1S,3S,4R,4'R,5'R)-tert-butyl 4',5'-diphenyl-3-(phenylsulfonyl)-7-azaspiro[bicyclo[2.2.1]hept[5]ene-2,2'-[1,3]dioxolane]-7-carboxylate