Molecular abundances relative to H₂ as a function of time, estimated from Chempl (Du 2021). The different colors correspond to the different H₂ number densities, from 10² cm⁻³ to 10⁶ cm⁻³. The solid and dashed lines represent the modeling results with the energy barrier ∆E₁₁ =20 K and ∆E₁₁ =1125 K for reaction (11), respectively. 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.