benzyl (2S,4R)-3,3-dimethyl-4-(((methylthio)carbonothioyl)oxy)-1-(9-phenyl-9H-fluoren-9-yl)pyrrolidine-2-carboxylate

(2S,4S)-benzyl 3,3-dimethyl-4-(((methylthio)carbonothioyl)oxy)-1-(9-phenyl-9H-fluoren-9-yl)pyrrolidine-2-carboxylate