[2-(1-Methylethoxy-O)phenylmethyl-C](nitrato-O,O′){rel-(2R,5R,7S)-tricyclo[3.3.1.13,7]decane-2,1-diyl[3-(2,4,6-trimethylphenyl)-1-imidazolidinyl-2-ylidene]}ruthenium (>80%)