You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[4-[(4-methyl-5-pyridin-4-yl-1,2,4-triazol-3-yl)sulfanyl]-3-nitrophenyl]sulfonylazepane is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H22N6O4S2
assistant