You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-(1-methylsulfonyl-3,5-dihydro-2H-1,4-benzodiazepin-4-yl)pyrazine-2-carboxylic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H16N4O4S
assistant