Synonyms: 1,3-Bis(2,4,6-trimethylphenyl)imidazolin-2-ylidene;1,3-Bis-mesityl-4,5-dihydroimidazol-2-ylidene;1,3-Dihydro-1,3-bis(2,4,6-trimethylphenyl)-2H-imidazol-2-ylidene;1,3-Dihydro-1,3-bis(mesityl)-2H-imidazol-2-ylidene;1,3-Dihydro-1,3-dimesityl-2H-imidazol-2-ylidene;1,3-Dimesityl-2-imidazolylidene; 1,3-Dimesityl-4-imidazolin-2-ylidene;1,3-Dimesitylimidazolin-2-ylidene