You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance N-[(1S)-1-(3-chlorophenyl)ethyl]-2-[5-(4-methylphenyl)-4-oxothieno[2,3-d]pyrimidin-3-yl]acetamide .
user
C23H20ClN3O2S
assistant