Rotational transition frequencies from astronomical observations
were reported by
(1) C. Cabezas, M. Agúndez, N. Marcelino, B. Tercero,
R. Fuentetaja, P. de Vicente, and J. Cernicharo,
2022, Astron. Astrophys. 659, Art. No. L8.
Calculations beyond 68 GHz should be viewed with caution.
The dipole moment was taken from a quantum chemical calculation
in (1).
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