You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule N-[(3Z)-5-fluoro-3-[(3-methyl-4-oxo-1,5,6,7-tetrahydropyrrolo[3,2-c]pyridin-2-yl)methylidene]-2-oxo-1H-indol-6-yl]-2-methylprop-2-enamide .
user
C21H19FN4O3
assistant