You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(6Z)-6-[(2,5-dimethyl-1-phenylpyrrol-3-yl)methylidene]-5-imino-3-methylsulfonyl-[1,2,4]thiadiazolo[4,5-a]pyrimidin-7-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H17N5O3S2
assistant