You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [5-cyanoimino-3-(1-methylpyridin-1-ium-2-yl)-2-pyridin-2-ylbenzo[g]quinoxalin-10-ylidene]cyanamide by IUPAC nomenclature, provide its molecular formula.
user
C25H15N8+
assistant