You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[[3-(2,4-difluoroanilino)-6-oxo-7-phenylthieno[2,3-b]pyridine-2-carbonyl]amino]piperidine-1-carboxylic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H22F2N4O4S
assistant