Rotational transition frequencies from astronomical observations were reported by
(1) N. Marcelino, M. Agúndez, B. Tercero, C. Cabezas, C. Bermúdez, J. D. Gallego, P. de Vicente, and J. Cernicharo, 2020, Astron. Astrophys. 643, Art. No. L6.
Calculations beyond 98 GHz should be viewed with caution. The dipole moment was taken from a quantum chemical calculation in (1).