75450-14-5
(E)-3-{(R)-1-[Methoxycarbonyl-(triphenyl-λ5-phosphanylidene)-methyl]-4-oxo-azetidin-2-ylsulfanyl}-pent-2-enedioic acid dimethyl ester
77603-33-9
(E)-3-((R)-1-Methoxyoxalyl-4-oxo-azetidin-2-ylsulfanyl)-pent-2-enedioic acid dimethyl ester
75450-11-2
(E)-3-[(R)-1-(Chloro-methoxycarbonyl-methyl)-4-oxo-azetidin-2-ylsulfanyl]-pent-2-enedioic acid dimethyl ester
75450-08-7
(E)-3-[(R)-1-(Hydroxy-methoxycarbonyl-methyl)-4-oxo-azetidin-2-ylsulfanyl]-pent-2-enedioic acid dimethyl ester
75450-05-4
(E)-3-((R)-4-Oxo-azetidin-2-ylsulfanyl)-pent-2-enedioic acid dimethyl ester