You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-benzyl-N-(5-fluoro-1,2,3,4-tetrahydroisoquinolin-6-yl)piperidine-4-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C22H26FN3O
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