You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 2-[[(1S)-1-(3,4-dichlorophenyl)ethyl]amino]-N-(5-methyl-2-phenylpyrazol-3-yl)acetamide is given. What is its corresponding molecular formula?
user
C20H20Cl2N4O
assistant