You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[[(2R)-butan-2-yl]amino]-6-(6-chloropyrazolo[1,5-a]pyrimidin-3-yl)-N-[(2R)-2-fluoro-3-hydroxy-3-methylbutyl]pyridine-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H26ClFN6O2
assistant