You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4-methoxypiperidin-4-yl)-[4-[(1,3,5-trimethylpyrazol-4-yl)methyl]piperazin-1-yl]methanone;trihydrochloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H34Cl3N5O2
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