You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2-aminoethyl)-2-oxo-N-(2-phenylethyl)-1,3,4,5-tetrahydro-1-benzazepine-7-sulfonamide;hydrochloride The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H26ClN3O3S
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