You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (5S,8aS)-5,7-dimethyl-2-[[2-(trifluoromethyl)phenyl]methyl]-1,5,8,8a-tetrahydroimidazo[1,5-a]pyrazine-3,6-dione into molecular formula.
user
C16H18F3N3O2
assistant