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-[5-[5-fluoro-2-(trifluoromethyl)phenyl]pent-4-yn-2-yl]thieno[2,3-d]pyrimidin-4-amine .
user
C18H13F4N3S
assistant