Discovery of interstellar 3-cyano propargyl radical, CH2CCCN C. Cabezas, M. Agúndez, N. Marcelino, B. Tercero, J. R. Pardo, P. de Vicente and J. Cernicharo A&A, 654 (2021) L9 Published online: 19 October 2021 DOI: 10.1051/0004-6361/202142156