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 7-[[4-(5-pyrrolidin-1-ylsulfonylpyridin-2-yl)piperazin-1-yl]methyl]-[1,3]thiazolo[3,2-a]pyrimidin-5-one .
user
C20H24N6O3S2
assistant