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 ethyl 2-[[2-[2-(4-chloroanilino)-2-oxoethyl]sulfanylacetyl]amino]-4,5-dimethylthiophene-3-carboxylate .
user
C19H21ClN2O4S2
assistant