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 (3R)-N-[4-(5-methylpyridin-3-yl)pyridin-2-yl]spiro[1-azabicyclo[2.2.2]octane-3,5'-4H-1,3-oxazole]-2'-amine ?
user
C20H23N5O
assistant