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 methyl 2-[5-acetyl-4-(3,4-dichlorophenyl)sulfanyl-7-fluoro-2,3-dihydro-1H-pyrrolo[1,2-a]indol-3-yl]acetate .
user
C22H18Cl2FNO3S
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