You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[azepan-4-yl(methyl)amino]-N-[(5-chlorothiophen-2-yl)methyl]-N-methylacetamide;hydrochloride by IUPAC nomenclature, provide its molecular formula.
user
C15H25Cl2N3OS
assistant