You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[1-[(3aR,6aS)-5-[(3-phenylphenyl)methoxy]-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]pyrrol-2-yl]-2-oxoethyl]pyrazole-3-carboxylic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H27N3O4
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