You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2,4-dichloro-5-methylsulfanylphenyl)-[3-(methylaminomethyl)piperidin-1-yl]methanone;hydrochloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H21Cl3N2OS
assistant