First detection of HS2 in a cold dark cloud G. Esplugues, M. Agúndez, G. Molpeceres, B. Tercero, C. Cabezas, N. Marcelino, R. Fuentetaja and J. Cernicharo A&A, 699 (2025) L2 Published online: 25 June 2025 DOI: 10.1051/0004-6361/202555384