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 (2R,3S)-2,3-bis[(4-chlorobenzoyl)oxy]-4-[4-[(4-methylphenyl)diazenyl]anilino]-4-oxobutanoic acid .
user
C31H23Cl2N3O7
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