You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(1R)-1-[(1R,5S)-3-[4,5-difluoro-N-methyl-2-(methylideneamino)anilino]-6-bicyclo[3.1.0]hexanyl]propyl]-3,3-difluoroazetidine-1-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H26F4N4O
assistant