You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(6-amino-1,2,3,4-tetrahydronaphthalen-1-yl)-2-(2,4-dichlorophenyl)acetamide;hydrochloride The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H19Cl3N2O
assistant