You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 6-(2,4-dichloro-5-methoxyanilino)-6-methoxy-7-[2-(1-methylpiperidin-4-yl)ethoxy]-5H-quinoline-3-carbonitrile by IUPAC nomenclature, provide its molecular formula.
user
C26H30Cl2N4O3
assistant