Study of the HCCNC and HNCCC isotopologs in TMC-1 J. Cernicharo, B. Tercero, C. Cabezas, M. Agúndez, E. Roueff, R. Fuentetaja, N. Marcelino and P. de Vicente A&A, 682 (2024) L13 Published online: 09 February 2024 DOI: 10.1051/0004-6361/202348822