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The spectrum of triatomic molecules with close rovibrational opposite paritylevels is sensitive to the $\mathcal{P}$,$\mathcal{T}$-odd effects. This makesthem a convenient platform for the experimental search of a new physics. Amongthe promising candidates one may distinguish the YbOH as a non-radioactivecompound with a heavy atom. The energy gap between levels of opposite parity,$l$-doubling, is of a great interest as it determines the electric fieldstrength required for the full polarization of the molecule. Likewise, theinfluence of the bending and stretching modes on the sensitivities to the$\mathcal{P}$,$\mathcal{T}$-violation requires a thorough investigation sincethe measurement would be performed on the excited vibrational states. Thismotivates us to obtain the rovibrational nuclear wavefunctions, taking intoaccount the anharmonicity of the potential. As a result, we get the values ofthe $E_{\rm eff}$ and $E_s$ for the lowest excited vibrational state anddetermine the $l$-doubling

Rovibrational structure of the Ytterbium monohydroxide molecule and the $\mathcal{P}$,$\mathcal{T}$-violation searches