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 [3-[2-tert-butyl-7-(trifluoromethyl)pyrazolo[1,5-a]pyrimidin-5-yl]piperidin-1-yl]-thiophen-2-ylmethanone .
user
C21H23F3N4OS
assistant