| —— | 
                                        methyl (1S,7aR)-1-[(1R)-2-methoxy-2-oxo-1-(phenylmethoxycarbonylamino)ethyl]-3,3-dimethyl-5-oxo-6,7-dihydro-1H-pyrrolo[1,2-c][1,3]oxazole-7a-carboxylate | 
                                        866331-58-0 | 
                                        C21H26N2O8 | 
                                        434.446 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        (2R)-1-tert-butyl 2-methyl 2-((1R,2S)-2-(methoxycarbonyl)-1,2-dihydroxyethyl)-5-oxopyrrolidine-1,2-dicarboxylate | 
                                        866331-53-5 | 
                                        C15H23NO9 | 
                                        361.349 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        methyl (2R)-2-[(4R,5S)-5-methoxycarbonyl-2-sulfanylidene-1,3-dioxolan-4-yl]-5-oxopyrrolidine-2-carboxylate | 
                                        866331-55-7 | 
                                        C11H13NO7S | 
                                        303.293 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        (2R)-methyl 2-((1S,2R)-2-(methoxycarbonyl)-2-azido-1-hydroxyethyl)-5-oxopyrrolidine-2-carboxylate | 
                                        866331-56-8 | 
                                        C10H14N4O6 | 
                                        286.244 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        (2R)-1-tert-butyl 2-methyl 2-(tert-butyldimethylsilyloxymethyl)-5-oxopyrrolidine-1,2-dicarboxylate | 
                                        866331-51-3 | 
                                        C18H33NO6Si | 
                                        387.549 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        (2R)-1-tert-butyl 2-methyl 2-(hydroxymethyl)-5-oxopyrrolidine-1,2-dicarboxylate | 
                                        866331-68-2 | 
                                        C12H19NO6 | 
                                        273.286 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        (2R)-1-tert-butyl 2-methyl 2-((E)-2-(methoxycarbonyl)vinyl)-5-oxopyrrolidine-1,2-dicarboxylate | 
                                        866331-52-4 | 
                                        C15H21NO7 | 
                                        327.334 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        (2R)-1-tert-butyl 2-formyl-5-oxopyrrolidine-1,2-dicarboxylate methyl ester | 
                                        866331-49-9 | 
                                        C12H17NO6 | 
                                        271.27 |