| —— | 
                                        (5R,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3-cyanomethylsulfanyl-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester | 
                                        81864-87-1 | 
                                        C23H29N3O6S2Si | 
                                        535.717 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        (5S,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-3-cyanomethylsulfanyl-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester | 
                                        83807-51-6 | 
                                        C23H29N3O6S2Si | 
                                        535.717 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        (5R,6S)-3-Cyanomethylsulfanyl-6-((R)-1-hydroxy-ethyl)-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester | 
                                        81878-57-1 | 
                                        C17H15N3O6S2 | 
                                        421.455 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        {(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-chloro-4-oxo-azetidin-1-yl}-(4-oxo-[1,3]dithietan-2-ylidene)-acetic acid 4-nitro-benzyl ester | 
                                        83807-48-1 | 
                                        C22H27ClN2O7S2Si | 
                                        559.136 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        (5S,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-7-oxo-3-thioxo-4-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid 4-nitro-benzyl ester | 
                                        80926-64-3 | 
                                        C21H28N2O6S2Si | 
                                        496.681 |