  CP-violating interaction of the nuclear magnetic quadrupole moment (MQM) with
electrons in the ytterbium mono-hydroxide molecule, $^{173}$YbOH, is
considered. Both the magnetic quadrupole moment (MQM) of the $^{173}$Yb nucleus
and the molecular interaction constant WM are estimated. Electron correlation
effects are taken into account within the relativistic Fock-space coupled
cluster method. Results are interpreted in terms of the strength constants of
CP-violating nuclear forces, neutron EDM, QCD vacuum angle $\theta$, quark EDM
and chromo-EDM.
