Chemistry in isolation: High CCH/HCO line ratio in the AMIGA galaxy CIG 638 S. Martín, L. Verdes-Montenegro, R. Aladro, D. Espada, M. Argudo-Fernández, C. Kramer and T. C. Scott A&A, 563 (2014) L6 Published online: 10 March 2014 DOI: 10.1051/0004-6361/201423501