You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-chloro-5-methyl-N-[1-(4,5,6,7-tetrahydro-1-benzothiophen-2-yl)ethyl]pyridin-3-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H19ClN2S
assistant