You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 5,6,7,8-tetrahydroimidazo[1,5-a]pyridin-3-yl-[2-(trifluoromethyl)phenyl]methanone by IUPAC nomenclature, provide its molecular formula.
user
C15H13F3N2O
assistant