  The symmetric top molecule YbOCH$_3$ is studied for its potential to
$\mathcal{P}$, $\mathcal{T}$-violation searches. The influence of the rotations
and vibrations of the YbOCH$_3$ on such violating effects as the electron
electric dipole moment (eEDM) and the scalar-pseudoscalar electron-nucleon
interaction (Ne-SPS) is studied using the coupled channels method. The
corresponding sensitivity parameters $E_{\rm eff}$ and $E_{\rm s}$ are
computed.
