(5R,6S)-6-<(1R)-hydroxyethyl>-2-<(2R)-pyrrolidin-2-yl>methyl-2-penem-3-carboxylic acid

methyl 2-((2R,3S)-3-((S)-1-((tert-butyldimethylsilyl)oxy)ethyl)-2-(methylthio)-4-oxoazetidin-1-yl)-3-methylbut-2-enoate

4-乙酰氧基氮杂环丁酮