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 1-[[2-tert-butyl-5-(trifluoromethyl)pyrazolo[1,5-a]pyrimidin-7-yl]amino]-3-phenylurea .
user
C18H19F3N6O
assistant