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

The title compound, C₂₅H₂₄N₂O₃, is one of the fluoran derivatives. The molecule has a Y-style structure which is composed of a half-chair xanthene moiety and an almost planar isobenzofuran fragment. The C-O single bond distance of 1.528 (6) Å in the lactone ring is longer than those normally found in both lactone and 2'-nitrofluoran.

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