In 2019, a study by Martin-Drumel et al. reported new experimental measurements of the rotational spectra and the associated constants for vinyl mercaptan, C₂H₃SH, in both of its conformers. The structures differ in whether the H atom bonded to S is on the same (syn) or opposite (anti) side of the C–C double bond. The image on this page shows the anti form. On the basis of the spectra, searches for the molecule toward Sgr B2(N) were made in the EMoCA spectrum of Belloche et al. Neither conformer was found to be present in the source.

Vinyl mercaptan (or ethenethiol) is not stable enough to manufacture and store. In the experimental work described above, it was formed in the lab via RF-discharge applied to ethane-1,2-dithiol. In a previous study, Almond et al. formed vinyl mercaptan by irradiating a mixture of acetylene and hydrogen sulfide with ultraviolet light.