You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name [2-oxo-2-(5-phenyl-3,4-dihydropyrazol-2-yl)ethyl] 2-(3,4-dichlorophenyl)acetate into its molecular formula.
user
C19H16Cl2N2O3
assistant