You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4-chlorophenyl)-[4-[5-[5-(trifluoromethyl)-1,2,4-oxadiazol-3-yl]pyridin-2-yl]piperazin-1-yl]methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H15ClF3N5O2
assistant