Comparison between Nautilus predictions obtained using our updated chemical network and the abundances observed toward TMC 1 (CP; see Table 4). Gray regions indicate the observed values. We assume an uncertainty of a factor of 2 in the measured abundances. The physical and chemical conditions used in our calculations are: n_H = 3 × 10⁴ cm⁻³, T_k = 10 K, A_V = 20 mag, , G₀=1 in Draine units and [S/H] = 7.5 × 10⁻⁷ (sulphur depleted by a factor of ~20).