You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N'-[5-chloro-2-[(2-methylphenyl)carbamoyl]indol-1-yl]-N-(2-chlorophenyl)oxamide by IUPAC nomenclature, provide its molecular formula.
user
C24H18Cl2N4O3
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