You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1,4-dimethyl-3-(trifluoromethyl)pyrazole;2,3-dimethyl-4-(trifluoromethyl)pyridine;5-methyl-1,2-oxazole is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H20F6N4O
assistant