Thioxoethenylidene, is a reactive heteroallene molecule with formula CCS.

[2] By condensing propadienedithione SCCCS or thioxopropadienone OCCCS in solid argon and irradiating with ultraviolet radiation, CCS is formed.

[1] Another way is via a glow discharge in a mixture of carbon disulfide and helium.

[1] CCS and the anion CCS− can be formed in solid neon matrices also.

A combination vibration and bending band is at 2763.4 cm−1[1] The microwave spectrum has emission lines 43 − 32 at 45.4 GHz and 21 - 10 at 22.3 GHz, important for detection of molecules in molecular clouds.