You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S,4S)-1-[[2-(3-ethylpiperidin-1-yl)-2-methylpropyl]carbamoyl]-4-(trifluoromethyl)pyrrolidine-3-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H30F3N3O3
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