You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 4-[3-chloro-5-(trifluoromethyl)pyridin-2-yl]-N-[3-(trifluoromethyl)cyclohexyl]piperazine-1-carboxamide .
user
C18H21ClF6N4O
assistant