You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-(2-ethylphenyl)-2-[4-[2-oxo-2-(N-propan-2-ylanilino)ethyl]piperazin-1-yl]acetamide into its molecular formula.
user
C25H34N4O2
assistant