You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 4-amino-N-[4-[(3-methylbenzoyl)amino]phenyl]thieno[2,3-d]pyrimidine-5-carboxamide is given. What is its corresponding molecular formula?
user
C21H17N5O2S
assistant