You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[2-(aminomethyl)cyclopentyl]-N-ethyl-4,5,6,7-tetrahydro-1-benzothiophene-2-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C17H26N2OS
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