Chemical survey of Class I protostars with the IRAM-30 m S. Mercimek, C. Codella, L. Podio, E. Bianchi, L. Chahine, M. Bouvier, A. López-Sepulcre, R. Neri and C. Ceccarelli A&A, 659 (2022) A67 Published online: 08 March 2022 DOI: 10.1051/0004-6361/202141790