For 1,3-butadiene in water, the errors in the frequencies are also minor, except for mode 24, where the error is about 5 cm In contrast to the other solute-solvent systems (not considering include solvent molecules in the partial Hessian), the normal modes of uracil in methanol have much higher frequency errors across the entire spectrum. The frequencies of normal modes 9, 23, 25, and 27 are close to 10 cm -1 , while the frequencies of modes 5, 8, 11, 14, and 29 are around 5 cm -1 . All of these normal modes have clear environmental contributions, and some low-frequency modes also have angular deviations. However, it is worth noting that the size of the environmental contributions does not necessarily correlate with the size of the errors. For example, the environmental contributions are rather small for normal mode 5, yet the frequency error is substantial. The IR intensity errors are most pronounced in normal modes 8, 9, 11, and 14, where the large environmental contributions come from O-H rocking motions of methanol that are mixed with in-plane bending modes of uracil. The Raman intensity errors are highest in normal modes 11, 24, and 25, where the two latter modes correspond to in-plane bending motions of uracil mixed with torsion motions of methanol. An explanation for the frequency errors that appear across the entire frequency range is that uracil, with its two carbonyl and two amide groups, provides two hydrogen-bond acceptors and two hydrogen-bond donors.