You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4-ethylpiperazin-1-yl)-[1-(6-methoxypyridin-3-yl)-5-phenylpyrazol-3-yl]methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H25N5O2
assistant