1-甲基-4,9-二氢-3H-吡啶并[3,4-b]吲哚

3-Ethoxy-2-acetyl-prop-2-ene acid ethyl ester

ethyl 2-ethyl-4-formyl-2-(phenylthio)butyrate ethylene acetal

(E)-2-methoxymethylene-butyryl chloride