You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[4-[(Z)-[[2-(3-chloro-4-methylanilino)-2-oxoacetyl]hydrazinylidene]methyl]-2-ethoxyphenyl] 4-ethoxybenzoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H26ClN3O6
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