1,1-Dimethylethyl 4-[(1E)-4-(dimethoxyphosphinyl)-3-oxo-1-buten-1-yl]-1-piperidinecarboxylate

tert-Butyl 4-[(1E)-4-(dimethoxyphosphoryl)-3-oxobut-1-en-1-yl]piperidine-1-carboxylate