6-Nitro-3-oxo-3H-spiro[2-benzofuran-1,9'-xanthene]-3',6'-diyl diacetate;Spiro(isobenzofuran-1(3H),9'-(9H)xanthen)-3-one, 3',6'-bis(acetyloxy)-6-nitro-;spiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one, 3',6'-bis(acetyloxy)-6-nitro-
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