You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named ethyl 2-[[(1S)-2,2,2-trichloro-1-(thiophene-2-carbonylamino)ethyl]amino]-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxylate is given. What is its corresponding molecular formula?
user
C18H19Cl3N2O3S2
assistant