(2S,3R,4S,5R)-diethyl 2-(10,10-dimethyl-3,3-dioxo-3lambda(6)-thia-4-azatricyclo(5.2.1.0(1,5))decan-4-ylcarbonyl)-5-phenylpyrrolidine-3,4-dicarboxylate
(2s,3r,4s,5r)-diethyl 2-(10,10-dimethyl-3,3-dioxo-3lambda(6)-thia-4-azatricyclo(5.2.1.0(1,5))decan-4-ylcarbonyl)-5-phenylpyrrolidine-3,4-dicarboxylate