You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(4S)-2-amino-1'-fluoro-3'-(5-fluoropyridin-3-yl)spiro[5,6-dihydro-1,3-thiazine-4,5'-chromeno[2,3-c]pyridine]-7'-yl]-5-methoxypyrazine-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H19F2N7O3S
assistant