You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-ethyl-1-(3-methoxyphenyl)-2-(5-methyl-1,2-oxazol-3-yl)-1H-chromeno[2,3-c]pyrrole-3,9-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C24H20N2O5
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