You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(6,7-dihydro-5H-cyclopenta[c]pyridin-6-yl)-N-methyl-2-oxo-1,3,4,5-tetrahydro-1-benzazepine-7-sulfonamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H21N3O3S
assistant