You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-(4-chlorophenyl)-1-(6-chloro-1,3,4,9-tetrahydroindeno[2,1-c]pyridin-2-yl)-2,3-dihydroxypropan-1-one .
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C21H19Cl2NO3
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