You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4E)-4-[(E)-3-(2,3-dimethoxyphenyl)-1-(4-methylphenyl)prop-2-enylidene]-5-methyl-2-phenylpyrazol-3-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H26N2O3
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