You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2,7-diazaspiro[4.4]nonan-2-yl-[2-(trifluoromethyl)phenyl]methanone;hydrochloride by IUPAC nomenclature, provide its molecular formula.
user
C15H18ClF3N2O
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