You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-2-[(2,6-dichlorobenzoyl)amino]-3-[4-[[(1S,3R)-3-(pyridin-2-ylamino)cyclopentanecarbonyl]amino]phenyl]propanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H26Cl2N4O4
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