Discovery of interstellar NC4NH+: Dicyanopolyynes are indeed abundant in space M. Agúndez, C. Cabezas, N. Marcelino, R. Fuentetaja, B. Tercero, P. de Vicente and J. Cernicharo A&A, 669 (2023) L1 Published online: 22 December 2022 DOI: 10.1051/0004-6361/202245492