| —— | 
                                        (5R)-6t-aminomethyl-3,3-dimethyl-7-oxo-(5rH)-4-thia-1-aza-bicyclo[3.2.0]heptane-2c-carboxylic acid benzyl ester | 
                                        63784-41-8 | 
                                        C16H20N2O3S | 
                                        320.412 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        (5R)-6t-(tert-butoxycarbonylamino-methyl)-3,3-dimethyl-7-oxo-(5rH)-4-thia-1-aza-bicyclo[3.2.0]heptane-2c-carboxylic acid benzyl ester | 
                                        63784-40-7 | 
                                        C21H28N2O5S | 
                                        420.53 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        (5R)-6t-carboxymethyl-3,3-dimethyl-7-oxo-(5rH)-4-thia-1-aza-bicyclo[3.2.0]heptane-2c-carboxylic acid benzyl ester | 
                                        63784-32-7 | 
                                        C17H19NO5S | 
                                        349.408 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        (5R)-6t-(benzylcarbamoyl-methyl)-3,3-dimethyl-7-oxo-(5rH)-4-thia-1-aza-bicyclo[3.2.0]heptane-2c-carboxylic acid benzyl ester | 
                                        63784-33-8 | 
                                        C24H26N2O4S | 
                                        438.547 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        (5R)-3,3-dimethyl-7-oxo-6t-[(2-phenyl-acetylamino)-methyl]-(5rH)-4-thia-1-aza-bicyclo[3.2.0]heptane-2c-carboxylic acid benzyl ester | 
                                        63784-43-0 | 
                                        C24H26N2O4S | 
                                        438.547 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        benzyl 6β-t-butoxycarbonylmethylpenicillanate | 
                                        63784-29-2 | 
                                        C21H27NO5S | 
                                        405.515 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        Benzyl 6α-(cyano)-6β-(phenoxyacetamido)penicillanate | 
                                        53198-77-9 | 
                                        C24H23N3O5S | 
                                        465.53 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        6-oxopenicillanic acid benzyl ester | 
                                        39126-59-5 | 
                                        C15H15NO4S | 
                                        305.354 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        (5R)-3,3-dimethyl-7-oxo-6t-[(toluene-4-sulfonylamino)-methyl]-(5rH)-4-thia-1-aza-bicyclo[3.2.0]heptane-2c-carboxylic acid benzyl ester | 
                                        63784-45-2 | 
                                        C23H26N2O5S2 | 
                                        474.602 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        (5R)-6t-{[((Ξ)-benzhydryloxycarbonyl-phenyl-methyl)-carbamoyl]-methyl}-3,3-dimethyl-7-oxo-(5rH)-4-thia-1-aza-bicyclo[3.2.0]heptane-2c-carboxylic acid benzyl ester | 
                                        63784-34-9 | 
                                        C38H36N2O6S | 
                                        648.78 |