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[1-(2-Methylprop-2-enoyloxy)-3-[(2-oxo-1,3-dioxolan-4-yl)methoxycarbonyloxy]propan-2-yl] 2,4-dioxo-3-oxatricyclo[7.3.1.05,13]trideca-1(12),5(13),6,8,10-pentaene-8-carboxylate


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