You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-tert-butyl-3-[[4-(trifluoromethyl)phenyl]-[3-(trifluoromethyl)pyridin-2-yl]methyl]thiourea The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H19F6N3S
assistant