YamamotoBlack 173;6'-(Diethylamino)-2'-[(2,3-dimethylphenyl)amino]-3'-methyl-3H-spiro[2-benzofuran-1,9'-xanthen]-3-one;6'-(diethylamino)-2'-[(dimethylphenyl)amino]-3'-methylspiro[isobenzofuran-1(3H),9'-[9H]xanthene]-3-one;
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