You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 2-ethyl-N'-(3-methyl-5-oxo-1-phenyl-2-propylpyrazol-4-yl)pentanediamide is given. What is its corresponding molecular formula?
user
C20H28N4O3
assistant