You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R,3R)-2,3-dihydroxy-N-[(1R)-1-(4-imidazol-1-ylphenyl)ethyl]-4-oxo-4-[(2R)-2-phenylpyrrolidin-1-yl]butanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H28N4O4
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