You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-[[5-tert-butyl-2-(3-methylphenyl)pyrazol-3-yl]amino]-2-oxoethyl]-N-ethylnonanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H42N4O2
assistant