You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 2-[3-[5-chloro-2-[(3S)-7-[5-chloro-2-(tetrazol-1-yl)phenyl]-5-oxo-2,3-dihydro-1H-indolizin-3-yl]-3H-pyrrol-4-yl]phenyl]acetic acid .
user
C27H20Cl2N6O3
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