You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[4-(3-chlorobenzoyl)-1,4-diazepan-1-yl]-1-piperazin-1-ylpropan-1-one;hydrochloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H28Cl2N4O2
assistant