You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl)-2-nitrobenzenesulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H12N6O4S
assistant