You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule [4-[4-(methoxymethyl)piperidine-4-carbonyl]piperazin-1-yl]-(5-methylthiophen-2-yl)methanone;hydrochloride into molecular formula.
user
C18H28ClN3O3S
assistant