You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[5-chloro-2-[(5-methyl-2-propan-2-ylpyrazol-3-yl)amino]pyridin-4-yl]amino]benzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H21ClN6O
assistant