Discovery of H2CCCH+ in TMC-1 W. G. D. P. Silva, J. Cernicharo, S. Schlemmer, N. Marcelino, J.-C. Loison, M. Agúndez, D. Gupta, V. Wakelam, S. Thorwirth, C. Cabezas et al. (6 more) A&A, 676 (2023) L1 Published online: 25 July 2023 DOI: 10.1051/0004-6361/202347174