You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-(2-hydroxyethyl)-2-methylpiperazin-1-yl]-(5-propan-2-yloxypyridin-3-yl)methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H25N3O3
assistant