You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (1R,2S)-2-(aminomethyl)-N-[1-(6-ethylpyrimidin-4-yl)piperidin-4-yl]cyclopentane-1-carboxamide into its molecular formula.
user
C18H29N5O
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