You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5S,6S)-5-[(2-hydroxy-5-methylphenyl)methylamino]-1-methyl-6-(2-methylpyrazol-3-yl)piperidin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H24N4O2
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