You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl N-[2-(2-carbamoyl-4,4-difluoropyrrolidin-1-yl)-2-oxoethyl]carbamate is the IUPAC name of a molecule. Please give its molecular formula.
user
C12H19F2N3O4
assistant