Chemical compositions of five Planck cold clumps V. Wakelam, P. Gratier, M. Ruaud, R. Le Gal, L. Majumdar, J.-C. Loison and K. M. Hickson A&A, 647 (2021) A172 Published online: 29 March 2021 DOI: 10.1051/0004-6361/202039367