You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 1-[2-chloro-5-[2-[1-(oxan-4-yl)pyrazol-4-yl]ethynyl]pyridin-4-yl]piperidin-3-ol ?
user
C20H23ClN4O2
assistant