You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(aminomethyl)-N,4-dimethyl-N-(thiophen-2-ylmethyl)-3,4-dihydro-2H-naphthalen-1-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H24N2S
assistant