You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[[2-(2-methoxy-2-oxoethyl)-6-methylimidazo[1,2-a]pyridin-3-yl]diazenyl]benzoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H16N4O4
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