You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 2-[(3-bromophenyl)carbamothioylamino]-5,6,7,8-tetrahydro-4H-cyclohepta[b]thiophene-3-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H19BrN2O2S2
assistant