You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 2-[3-[5-(furan-2-ylmethylidene)-4-oxo-2-sulfanylidene-1,3-thiazolidin-3-yl]propanoylamino]-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxamide .
user
C20H19N3O4S3
assistant