You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-chloro-N-[[(2R,3S)-2-(1H-pyrazol-4-yl)oxan-3-yl]methyl]-2-pyrrolidin-1-ylpyrimidine-4-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H23ClN6O2
assistant