You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[3-[(4aS,7aS)-3-amino-2-methyl-1,1-dioxo-7,7a-dihydro-5H-furo[3,4-e][1,2,4]thiadiazin-4a-yl]-4-fluorophenyl]-5-(trifluoromethyl)pyrazine-2-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H16F4N6O4S
assistant