  Parity-violating differences in rotational constants of a chiral 5d
transition metal complex, that was previously experimentally well-characterised
by broad-band microwave spectroscopy, are predicted with a recently established
efficient analytical derivative technique. Relative differences $\Delta X/X$
between rotational constants $X=A,B,C$ of enantiomers of the title compound are
found to be on the order of $10^{-14}$, which is a favourably large effect. The
quality of the theoretical estimates is carefully assessed by computing nuclear
electric quadrupole coupling constants that agree well with experiment.
