You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl 2-benzamido-7a-[2-fluoro-5-[(Z)-2-fluoro-2-(5-prop-2-ynoxypyrazin-2-yl)ethenyl]phenyl]-4,4a,5,7-tetrahydropyrrolo[3,4-d][1,3]thiazine-6-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C33H31F2N5O4S
assistant