You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 1-[1'-(cyclopentylmethyl)spiro[1,3-dihydroisoquinoline-4,4'-piperidine]-2-yl]ethanone;hydrochloride using the IUPAC nomenclature.
user
C21H31ClN2O
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