You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 3-(oxolan-2-yl)-1-[3-[(5S,7R)-7-(trifluoromethyl)-4,5,6,7-tetrahydro-[1,2,4]triazolo[1,5-a]pyrimidin-5-yl]piperidin-1-yl]propan-1-one .
user
C18H26F3N5O2
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