You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 2-[(3R)-1-(1-ethyl-3-methylpyrazol-4-yl)sulfonylpyrrolidin-3-yl]-N-(5-fluoropyridin-2-yl)-6-methylpyridin-4-amine ?
user
C21H25FN6O2S
assistant