The lines have been reported by
(1) M. Ohishi, N. Kaifu, K. Kawaguchi, A. Murukami, S. Saito, S. Yamamoto S. Ishikawa, Y. Fujita, Y. Shiratori, and W. M. Irvine, 1989, Astrophys. J. 345, L83; and by
(2) V. D. Gordon, E. S. Nathan, A. J. Apponi, M. C. McCarthy, P. Thaddeus, and P. Botschwina, 2000, J. Chem. Phys. 113, 5311.
The dipole moment is from an ab initio calculation in (2).