You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-[(2E)-2-(1-benzothiophen-2-ylmethylidene)hydrazinyl]-2-oxoethyl]-3,4-dimethoxybenzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H19N3O4S
assistant