You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(2R)-1-[(3S)-3-[[(3-fluorophenyl)carbamoylamino]methyl]piperidin-1-yl]-3-methyl-1-oxobutan-2-yl]-2-phenylacetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H33FN4O3
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