therapies ref name boschrosich ref laboratory made decisive contributions developing antiserum diphtheria standardizing therapeutic serums ref name chf ref example organometallic molecule catalyst called grubbs' catalyst formula often given rucl sub sub pcy sub sub sub sub chph ball stick model based x ray crystallography single metal atom ruthenium ru turquoise center structure two chlorines green bonded ruthenium atom carbon atoms black hydrogens gray white phosphorus orange phosphorus ligand bond tricyclohexyl phosphine pcy center another pcy ligand appears top image
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