(1R,3R,4S,7R,8R,11R)-8-(4-chlorophenyl)-4-methyl-3,11-diphenyl-2,9-dioxa-10-thia-5-azatricyclo[5.2.2.01,5]undecan-6-one

(1R,3R,4S,7R,8R,11R)-4-methyl-8-(4-nitrophenyl)-3,11-diphenyl-2,9-dioxa-10-thia-5-azatricyclo[5.2.2.01,5]undecan-6-one