You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(E)-[4,5-dioxo-2-(4-propan-2-yloxyphenyl)-1-(pyridin-1-ium-3-ylmethyl)pyrrolidin-3-ylidene]-(4-methylphenyl)methanolate is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H26N2O4
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