You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S)-2-[(1S)-5-carbamoyl-2-adamantyl]-3-(3,5-difluoropyridin-2-yl)oxypyrrolidine-1-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H25F2N3O4
assistant