You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule (5E)-5-[(1,3-dimethyl-2-oxobenzimidazol-5-yl)methylidene]-1-phenyl-2-sulfanylidene-1,3-diazinane-4,6-dione ?
user
C20H16N4O3S
assistant