You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule pyridin-3-yl-[2-[2-(5-pyridin-4-yl-1,2,4-oxadiazol-3-yl)ethyl]pyrrolidin-1-yl]methanone into molecular formula.
user
C19H19N5O2
assistant