You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [1-(3-chlorophenyl)cyclopentyl]-[4-(cyclopropylmethylamino)piperidin-1-yl]methanone;hydrochloride by IUPAC nomenclature, provide its molecular formula.
user
C21H30Cl2N2O
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