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 (4Z)-4-[(3-chloro-5-ethoxy-4-hydroxyphenyl)methylidene]-2-(3-chloro-4-methylphenyl)-5-methylpyrazol-3-one .
user
C20H18Cl2N2O3
assistant