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 (3-chlorophenyl)-[4-[4-[(5-methyl-1H-pyrazol-3-yl)amino]thieno[3,2-d]pyrimidin-2-yl]piperazin-1-yl]methanone .
user
C21H20ClN7OS
assistant