You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-amino-N-(1,3-benzodioxol-5-ylmethyl)-5-chloro-4,6-dimethylthieno[2,3-b]pyridine-2-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H16ClN3O3S
assistant