The addition product of N-thiocarbamoylpiperidine and dimethyl acetylenedicarboxylate has been shown by X-ray structure analysis to be 5-methoxycarbonylmethylene-2-piperidino-Δ2-1,3-thiazol-4-one (III)
A. F. Cameron, N. J. Hair, N. F. Elmore and P. J. Taylor, J. Chem. Soc. D, 1970, 890 DOI: 10.1039/C29700000890
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