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 (2E)-2-(6-cyano-3-oxo-1H-benzo[de]quinolin-2-ylidene)-3-oxo-1H-benzo[de]quinoline-6-carbonitrile .
user
C26H12N4O2
assistant