You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 1-[2-(3-cyclopropyl-1,2,4-oxadiazol-5-yl)pyrrolidin-1-yl]-2-(1-methylindol-3-yl)ethanone .
user
C20H22N4O2
assistant