You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance methyl 2-[5-[(2-amino-3,7-dicyano-4,6-dimethylcyclopenta[b]pyridin-1-ium-5-ylidene)methyl]furan-2-yl]benzoate .
user
C25H19N4O3+
assistant