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We present the first detection of HCNS (thiofulminic acid) in space with theQUIJOTE line survey in the direction of TMC-1. We performed a complete study ofthe isomers of CHNS and CHNO, including NCO and NCS. The derived columndensities for HCNS, HNCS, and HSCN are (9.0+/-0.5)e9, (3.2+/-0.1)e11, and(8.3+/-0.4)e11 cm-2, respectively. The HNCS/HSCN abundance ratio is 0.38. Theabundance ratios HNCO/HNCS, HCNO/HCNS, HOCN/HSCN, and NCO/NCS are 34+/-4,8.3+/-0.7, 0.18+/-0.03, and 0.78+/-0.07, respectively. These ratios cannot becorrectly reproduced by our gas-phase chemical models, which suggests thatformation paths for these species are missing, and/or that the adopteddissociative recombination rates for their protonated precursors have to berevised. The isotopologues H15NCO, DNCO, N13CO, DCNO, H34SCN, and DSCN havealso been detected with the ultrasensitive QUIJOTE line survey.

Discovery of thiofulminic acid with the QUIJOTE line survey: A study of the isomers of HNCS and HNCO in TMC-1