Synonyms: 1,3-BIS(2,4,6-TRIMETHYLPHENYL)-2-IMIDAZOLIDINYLIDENE]DICHLORO[[2-(1-METHYLACETOXY)PHENYL]METHYLENERUTHENIUM(II);Umicore M51;UMicore M51, 15% Ru, Product of UMicore;[1,3-Bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene]dichloro[[2-(1-methyl-2-oxopropoxy)phenyl]methylene]ruthenium