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 N-[4-[4-(cyclopentylamino)-6-methyl-2-(4-methylpiperazin-1-yl)pyrimidin-5-yl]sulfinylthiophen-3-yl]acetamide .
user
C21H30N6O2S2
assistant