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 3-[6-[[(3R)-1-(2,2-difluoro-2-phenylethyl)pyrrolidin-3-yl]amino]-5-fluoropyridin-3-yl]-N-hydroxyprop-2-enamide ?
user
C20H21F3N4O2
assistant