You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[(4-chlorophenyl)-methyl-oxo-lambda6-sulfanylidene]-3,4-dimethylthieno[2,3-b]thiophene-5-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C16H14ClNO2S3
assistant