Ball-and-stick model of a molecule of the Hoveyda-Grubbs first generation catalyst, C28H45Cl2OPRu, i.e. . H-atoms are omitted! "Colour code:" :#393939 Carbon, C: grey-black :#20F020 Chlorine, Cl: green :#FF00FF Phosphorus, P: magenta :#F00000 Oxygen, O: red :#800000 Ruthenium, Ru: maroon :#FFFFFF Hydrogen, H: white Structure drawn with "ChemDraw" 12.0.2; energy minimized using MM2.