You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(3-chlorophenyl)-6-(4-chlorophenyl)-N-[(2S)-1-hydroxy-4-methylpentan-2-yl]-3-oxopyridazine-4-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H23Cl2N3O3
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