You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [4-(3-amino-1H-1,2,4-triazol-5-yl)piperidin-1-yl]-(1-methyl-5-phenylpyrazol-3-yl)methanone by IUPAC nomenclature, provide its molecular formula.
user
C18H21N7O
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