Molecular abundances relative to H₂ as a function of time, calculated from Chempl (Du 2021). The dashed blue lines represent the modeling results in Sect. 4.2, while the solid red curves represent the modeling results obtained when including reaction (7) in the underlying chemical network. The observed molecular abundances in our studies are indicated by the gray shaded regions, while the molecular abundances in TMC1 (Agúndez & Wakelam 2013) are indicated by the cyan shaded regions. The other physical conditions are indicated at the top of this figure.