You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as N-[4-[1-(2-cyanobutanoyl)-3,6-dihydro-2H-pyridin-4-yl]-1H-pyrrolo[2,3-b]pyridin-6-yl]cyclopropanecarboxamide using the IUPAC nomenclature.
user
C21H23N5O2
assistant