3'-(Diethylamino)-7'-methylfluoran

6'-Diethylamino-2'-methylspiro[phthalide-3,9'-[9H]xanthene]

6'-(diethylaMino)-2'-Methylspiro[2-benzofuran-3,9'-xanthene]-1-one

6-Diethylamino-2-methylspiro[9H-xanthene-9,1'(3'H)-isobenzofuran]-3'-one