You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N'-[(Z)-[1-(3-chlorophenyl)-2,5-dimethylpyrrol-3-yl]methylideneamino]-N-(2-ethoxyphenyl)oxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H23ClN4O3
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