You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
10-(6-azidoindol-1-ium-4-ylidene)-N,N,5,5,7-pentamethylbenzo[b][1]benzosilin-3-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H26N5Si+
assistant