The astronomical lines have been reported by
(1) C. Cabezas, J. R. Pardo, M. Agúndez, B. Tercero, N. Marcelino, Y. Endo, P. de Vicente, M. Guélin, and J. Cernicharo, 2023, Astron. Astrophys. 672, Art. No. L12.
The calculations should be quite reliable up to about 66 GHz.
The dipole moment was taken from a quantum chemical calculation in (1).