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On the Detection of Protonated Butynedinitrile, NC<sub>4</sub>NH<sup>+</sup>, in Space
M. Agúndez, C. Cabezas, N. Marcelino, R. Fuentetaja, B. Tercero, P. de Vicente, and J. Cernicharo
reported on
Discovery of Interstellar NC<sub>4</sub>NH<sup>+</sup>: Dicyanopolyynes are indeed Abundant in Space,
Astron. Astrophys. 669, Art. No. L1 (2022).