Identification of the interstellar 1-cyano propargyl radical (HCCCHCN) in TMC-1 C. Cabezas, M. Agúndez, N. Marcelino, C. H. Chang, R. Fuentetaja, B. Tercero, M. Nakajima, Y. Endo, P. de Vicente and J. Cernicharo A&A, 693 (2025) L14 Published online: 13 January 2025 DOI: 10.1051/0004-6361/202453419