2-(benzhydrylidene-amino)-3-cyclobutyl-propionic acid ethyl ester

溴甲基环丁烷

methyl 3-tert-butoxycarbonylamino-4-cyclobutyl-2-hydroxybutyrate

3-(tert-butoxycarbonylamino)-4-cyclobutyl-2-hydroxybutanoic acid

3-苯基-3,7A-二氢-1H-吡咯并[1,5-c]恶唑-5-酮