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system
Name the molecular formula for the molecule established as ethyl 2-[[2-[2-[(5-methyl-1,2-oxazol-3-yl)oxy]acetyl]oxyacetyl]amino]-5,6-dihydro-4H-cyclopenta[b]thiophene-3-carboxylate using the IUPAC nomenclature.
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C18H20N2O7S
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