Synchrotron-based far-infrared spectroscopy of furan: Rotational analysis of the ν14, ν11, ν18 and ν19 vibrational levels

► Synchrotron-based far-IR Fourier transform spectroscopy of furan. ► Rotational analysis of four vibrationally excited levels. ► Second-order Coriolis coupling between the lowest two vibrationally excited levels.