You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (5Z)-3-benzyl-5-[(1,3-dimethyl-6-nitro-2-oxobenzimidazol-5-yl)methylidene]-1,3-thiazolidine-2,4-dione .
user
C20H16N4O5S
assistant