You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 5-[[1-(5-chlorothiophen-2-yl)sulfonylpiperidine-2-carbonyl]amino]-3-methyl-4-thiocyanatothiophene-2-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H20ClN3O5S4
assistant