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-[4-(1H-indol-3-yl)-3,6-dihydro-2H-pyridin-1-yl]-3-(oxolan-2-yl)propan-1-one .
user
C20H24N2O2
assistant