Compound 5

(E)-(((1,3-bis(2,6-diisopropylphenyl)-2,5-diphenyl-3,5-dihydro-4H-imidazol-1-ium-5-id-4-ylidene)methylene)diazen-1-ium-2-yl)tris(perfluorophenyl)borate

From: Isolation and reactivity of an elusive diazoalkene