You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5S)-7-bromo-5-phenyl-4-(2-piperidin-1-ium-1-ylacetyl)-3,5-dihydro-1H-1,4-benzodiazepin-2-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H25BrN3O2+
assistant