You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(3-chloro-5,6-dihydrobenzo[b][1]benzothiepin-6-yl)-2-(4-pyrimidin-2-ylpiperazin-1-yl)acetamide;dihydrochloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C24H26Cl3N5OS
assistant