The results from MuFi are close to those previously obtained with TAMkinTools 31 and yield the same zero-point energy contribution by HR of 0.12 kJ mol -1 , cf. Fig. . The lowest energy level (level number three) for which the second-lowest minimum is populated (i.e. the zero-point energy of the other π conformation) is slightly shifted from 0.48 kJ mol -1 to 0.54 kJ mol -1 , cf. Fig. . Altogether, compared to a tailored TAMkinTools treatment that properly combines high-and low-level data, the MuFi modeling approach gives results of similar quality.