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Methyl (1R,3S,6Z,9S,11Z,13S)-7-acetyloxy-3-(2-methoxy-2-oxoethyl)-3-methyl-5,15-dioxo-9-prop-1-en-2-yl-4,14,16-trioxabicyclo[11.3.0]hexadeca-6,11-diene-12-carboxylate


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