(1,3,4,5-tetramethylimidazol-2-ylidene) bis(1,2,3,4,5-pentamethylcyclopentadienyl)calcium Arduengo, A. J., III; Davidson, F.; Krafczyk, R.; Marshall, W. J.; Tamm, M. Organometal., 1998, 17, 3375.
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