You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-[3-(3-chloro-4-ethylphenyl)pyrazol-1-yl]ethyl]-5-ethyl-1H-pyrazole-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H22ClN5O
assistant