You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named ethyl (6S)-2-[[2-[(2Z)-2-[(2-bromophenyl)methylidene]hydrazinyl]-2-oxoacetyl]amino]-6-methyl-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxylate is given. What is its corresponding molecular formula?
user
C21H22BrN3O4S
assistant