You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
diethyl 5-[3-cyano-4-(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)-2-oxobut-3-enyl]-3-methylthiophene-2,4-dicarboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H25N3O6S
assistant