You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3aR,6S,6aS)-1-[(2S)-3,3-dimethyl-2-[[(2R)-2-methylbutanoyl]amino]butanoyl]-6-[(4-fluorophenyl)methoxy]-N-methyl-2,3,3a,5,6,6a-hexahydropyrrolo[3,2-b]pyrrole-4-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H39FN4O4
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