You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(1S)-cyclopent-2-en-1-yl]-N-[2-oxo-2-(2,4,6-trimethylanilino)ethyl]acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H24N2O2
assistant