| —— | 
                                        9H-fluoren-9-ylmethyl (2S,3aS,4R,4'R)-4'-[(2-aminobenzoyl)amino]-2-(2-methylpropyl)-1,5'-dioxospiro[2,3a-dihydroimidazo[1,2-a]indole-4,2'-oxolane]-3-carboxylate | 
                                        422319-58-2 | 
                                        C39H36N4O6 | 
                                        656.738 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        9H-fluoren-9-ylmethyl (2S,3aS,4R,4'R)-2-(2-methylpropyl)-1,5'-dioxo-4'-(2,2,2-trichloroethoxycarbonylamino)spiro[2,3a-dihydroimidazo[1,2-a]indole-4,2'-oxolane]-3-carboxylate | 
                                        422319-57-1 | 
                                        C35H32Cl3N3O7 | 
                                        713.014 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        benzyl (2S,3aS,4R)-4-hydroxy-4-[(2R)-3-methoxy-3-oxo-2-(2,2,2-trichloroethoxycarbonylamino)propyl]-2-(2-methylpropyl)-1-oxo-2,3a-dihydroimidazo[1,2-a]indole-3-carboxylate | 
                                        422319-55-9 | 
                                        C29H32Cl3N3O8 | 
                                        656.947 |