上游原料
(2-Ethoxy-2-oxoethyl)(dimethyl)sulfonium bromideEthyl 2-bromoacetate; Ethyl bromoacetate2-cyclopenten-1-oneethyl (1S,5R,6S)-2-oxobicyclo[3.1.0]hexane-6-carboxylateethyl (1S,5R,6S)-2-[(trimethylsilyl)oxy]bicyclo[3.1.0]hex-2-ene-6-carboxylateethyl (1R,5S,6S)-4-oxobicyclo[3.1.0]hex-2-ene-6-carboxylateethyl (1R,2R,4R,6S,7S)-5-oxo-3-oxatricyclo[4.1.0.0(2,4)]heptane-7-carboxylateethyl (1R,2S,5S,6S)-2-hydroxy-4-oxobicyclo[3.1.0]hexane-6-carboxylate
