| —— | 
                                        (3aS,3bR,6S,6aS,7aR)-2,2-Dimethyl-6-(2-oxo-cyclopentyl)-hexahydro-1,3-dioxa-4-aza-cyclopenta[a]pentalene-4-carboxylic acid benzyl ester | 
                                        359436-41-2 | 
                                        C23H29NO5 | 
                                        399.487 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        (3aS,3bR,6S,6aS,7aR)-6-(3-Methoxycarbonyl-2-oxo-cyclopentyl)-2,2-dimethyl-hexahydro-1,3-dioxa-4-aza-cyclopenta[a]pentalene-4-carboxylic acid benzyl ester | 
                                        359436-42-3 | 
                                        C25H31NO7 | 
                                        457.524 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        (3aS,3bR,6R,6aS,7aR)-6-(2-Methoxycarbonyl-cyclopent-2-enyl)-2,2-dimethyl-hexahydro-1,3-dioxa-4-aza-cyclopenta[a]pentalene-4-carboxylic acid benzyl ester | 
                                        359436-47-8 | 
                                        C25H31NO6 | 
                                        441.524 | 
                                    
                                                                                                                                            
                                        | —— | 
                                        (3aS,3bR,6S,6aS,7aR)-2,2-Dimethyl-6-(2-trifluoromethanesulfonyloxy-cyclopent-2-enyl)-hexahydro-1,3-dioxa-4-aza-cyclopenta[a]pentalene-4-carboxylic acid benzyl ester | 
                                        359436-46-7 | 
                                        C24H28F3NO7S | 
                                        531.55 |