You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[(1E,3E)-4-ethoxycarbonyl-5-oxohexa-1,3-dienyl]-(2-methylsulfonylethyl)amino]ethanesulfonic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C14H23NO8S2
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