The astronomical lines have been reported by
(1) J. Cernicharo, C. Cabezas, J. R. Pardo, M. Agúndez,
O. Roncero, B. Tercero, N. Marcelino, M. Guélin, Y. Endo,
and P. de Vicente,
2023, Astron. Astrophys. 672, Art. No. L13.
The calculations should be quite reliable up to 150 GHz.
The dipole moment was taken from a quantum chemical calculation
in (1).
Its value should be viewed with some caution.
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