You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 2-(6,7-dihydro-5H-[1,3]thiazolo[3,2-a]pyrimidin-3-yl)-N-methyl-N-[[(3S)-1-phenylpyrrolidin-3-yl]methyl]acetamide ?
user
C20H26N4OS
assistant