| —— | 
                                        3-azido-4-oxo-octahydro-1-oxa-7-thia-4a-aza-cyclopropa[e]azulene-5-carboxylic acid methyl ester | 
                                        872094-52-5 | 
                                        C10H12N4O4S | 
                                        284.296 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        (3R,6S,7S,8S,9R,9aR)-methyl octahydro-6,7,8,9-tetrahydroxy-5-oxothiazolo[3,2-a]azepine-3-carboxylate | 
                                        221143-53-9 | 
                                        C10H15NO7S | 
                                        293.298 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        methyl (1R,2R,4R,6S,9R)-7-oxo-6-(trifluoromethylsulfonyloxy)-3-oxa-11-thia-8-azatricyclo[6.3.0.02,4]undecane-9-carboxylate | 
                                        872094-44-5 | 
                                        C11H12F3NO7S2 | 
                                        391.346 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        methyl (1R,2R,4R,9R)-7-oxo-6-(trifluoromethylsulfonyloxy)-3-oxa-11-thia-8-azatricyclo[6.3.0.02,4]undec-5-ene-9-carboxylate | 
                                        872094-37-6 | 
                                        C11H10F3NO7S2 | 
                                        389.33 |