You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 6-oxo-N-(3-piperidin-1-ylpropyl)-5H-benzo[b][1,4]benzothiazepine-3-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C22H25N3O2S
assistant