225219-88-5
(2aS,2bS,5aS,6R)-2-Eth-(Z)-ylidene-2b-methyl-1,4-dioxo-octahydro-3-oxa-6a-aza-cyclobuta[a]pentalene-6-carboxylic acid benzyl ester
159332-17-9
3S-<1R-(tert-butyldimethylsilanyloxy)ethyl>-4S-(2S-methyl-5-oxo-2,5-dihydrofuran-2-yl)azetidin-2-one
225219-70-5
(2S,2aS,2bS,5aS,6R)-2-((R)-1-Hydroxy-ethyl)-2b-methyl-1,4-dioxo-octahydro-3-oxa-6a-aza-cyclobuta[a]pentalene-6-carboxylic acid benzyl ester
225219-87-4
(2S,2aS,2bS,5aS,6R)-2-((R)-1-Methanesulfonyloxy-ethyl)-2b-methyl-1,4-dioxo-octahydro-3-oxa-6a-aza-cyclobuta[a]pentalene-6-carboxylic acid benzyl ester
225219-68-1
<3S-<1R-(tert-butyldimethylsilanyloxy)ethyl>-2S-(2-methyl-5-oxo-2,5-dihydrofuran-2-yl)-4S-oxo-azetidin-1-yl>acetic acid benzyl ester