“…For these objects detailed data on IR spectroscopy are available [57], [58], [59] that makes them to be good test objects for verifying the accuracy of various theoretical methods. Ring-puckering vibration (see [57], [58], [59], [60], [61], and refs.therein) along with ring-twisting, ring-flapping, wagging, torsion and inversion vibrations [57], [62], [63], [64] is an interesting interdisciplinary phenomenon for chemical physics, IR spectroscopy and physics of molecules. It was studied experimentally in details mainly in the laboratory of J. Laane and a lot of experimental data for numerous objects is available at present.…”