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What is the molecular formula of the compound with this IUPAC name (2S,5R,6R)-3,3-dimethyl-7-oxo-6-[[(E)-3-(4-oxochromen-3-yl)prop-2-enoyl]amino]-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid ?
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C20H18N2O6S
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