You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 3-[[4-chloro-1-(3-chloro-2-methylphenyl)-2,5-dioxopyrrol-3-yl]amino]-N-(2-ethoxyphenyl)benzamide ?
user
C26H21Cl2N3O4
assistant