IUPAC:3',6'-bis(acetyloxy)-2',7'-dichloro-3-oxo-3H-spiro[2-benzofuran-1,9'-xanthene]-5-carboxylic acid; 3',6'-bis(acetyloxy)-2',7'-dichloro-3-oxo-3H-spiro[2-benzofuran-1,9'-xanthene]-6-carboxylic acid
IUPAC:3',6'-bis(acetyloxy)-2',7'-dichloro-3-oxo-3H-spiro[2-benzofuran-1,9'-xanthene]-5-carboxylic acid; 3',6'-bis(acetyloxy)-2',7'-dichloro-3-oxo-3H-spiro[2-benzofuran-1,9'-xanthene]-6-carboxylic acid