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 5-fluoro-3-[(E)-(6-pyridin-3-yl-3,4-dihydro-2H-pyridin-5-ylidene)methyl]-1H-indole .
user
C19H16FN3
assistant