You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5-chlorothiophen-2-yl)-[4-[3-chloro-5-(trifluoromethyl)pyridin-2-yl]piperazin-1-yl]methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H12Cl2F3N3OS
assistant