| —— | (3S)-4-Isopropylidene-1-(1-(methoxycarbonyl)-2-methylprop-1-enyl)-3-phthalimido-2-azetidinone | 69939-46-4 | C20H20N2O5 | 368.389 | 
                                                                                                                                            
                                        | —— | (3S)-4-Diphenylmethylidene-1-(1-(methoxycarbonyl)-2-methylprop-1-enyl)-3-phthalimido-2-azetidinone | 72727-46-9 | C30H24N2O5 | 492.531 | 
                                                                                                                                            
                                        | —— | (3S)-4-(Bis(ethoxycarbonyl)methylidene)-1-(1-(methoxycarbonyl)-2-methylprop-1-enyl)-3-phthalimido-2-azetidinone | 72727-47-0 | C24H24N2O9 | 484.463 | 
                                                                                                                                            
                                        | —— | 3-methyl-2-((2Ξ,3Ξ,6R)-2-methyl-5-oxo-6-phthalimido-1-thia-4-aza-spiro[2.3]hex-4-yl)-but-2-enoic acid methyl ester | 69939-42-0 | C19H18N2O5S | 386.428 | 
                                                                                                                                            
                                        | —— | 2-((3Ξ,6R)-2,2-dimethyl-5-oxo-6-phthalimido-1-thia-4-aza-spiro[2.3]hex-4-yl)-3-methyl-but-2-enoic acid methyl ester | 69939-44-2 | C20H20N2O5S | 400.455 | 
                                                                                                                                            
                                        | —— | 2-((3R,4Ξ)-7,7-dimethyl-2-oxo-3-phthalimido-8-thia-1,5,6-triaza-spiro[3.4]oct-5-en-1-yl)-3-methyl-but-2-enoic acid methyl ester | 69939-43-1 | C20H20N4O5S | 428.469 | 
                                                                                                                                            
                                        | —— | 2-[(R)-6-(1,3-Dioxo-1,3-dihydro-isoindol-2-yl)-5-oxo-2,2-diphenyl-1-thia-4-aza-spiro[2.3]hex-4-yl]-3-methyl-but-2-enoic acid methyl ester | 72727-44-7 | C30H24N2O5S | 524.597 |