You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-chloro-N-[2-[2-[(3-methoxyphenyl)methylidene]hydrazinyl]-2-oxoethyl]-1-benzothiophene-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H16ClN3O3S
assistant