You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2Z)-N-(2-methoxyphenyl)-2-[(6-nitro-2-sulfanylidene-3H-benzimidazol-1-yl)methylidene]-3-oxobutanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H16N4O5S
assistant