上游原料
1-bromoethane；ethyl bromide(1R,2S,4R,5S)-9-methyl-3-oxa-9-azatricyclo[3.3.1.0(2,4)]non-7-yl (2S)-3-hydroxy-2-phenylpropanoate(1R,2S,4R,5S)-3-oxa-9-azatricyclo[3.3.1.0(2,4)]non-7-yl (2S)-3-hydroxy-2-phenylpropanoate(1R,2S,4R,5S)-9-ethyl-3-oxa-9-azatricyclo[3.3.1.0(2,4)]non-7-yl (2S)-3-hydroxy-2-phenylpropanoate
