You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4E,5E)-5-[(4E)-2-(dimethylamino)-4-indol-3-ylidene-1H-imidazol-5-ylidene]-4-indol-3-ylidene-N,N-dimethyl-1H-imidazol-2-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H24N8
assistant