You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3,3-difluoro-1-[[2-[1-[(4-fluoroanilino)-hydroxymethyl]-2-methyl-6,7-dihydro-5H-pyrrolizin-3-yl]-2-oxoacetyl]amino]-N-methylcyclobutane-1-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H25F3N4O4
assistant