You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(1H-benzimidazol-2-ylmethyl)-N-(4,5,6,7-tetrahydro-1,3-benzothiazol-2-yl)piperidine-4-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H25N5OS
assistant