You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2Z)-N-(2-ethylphenyl)-4-(3-methyl-4-oxido-1-oxoquinoxalin-1-ium-2-yl)-2-[(4-methylphenyl)sulfonylhydrazinylidene]-4-oxobutanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H27N5O6S
assistant