2-(3',6'-Bis(diethylamino)-3-oxospiro[isoindoline-1,9'-xanthen]-2-yl)-1H-benzo[de]isoquinoline-1,3(2H)-dione

2-(3',6'-Bis(diethylamino)-3-oxospiro[isoindoline-1,9'-xanthen]-2-yl)-1H-benzo[de]isoquinoline-1,3(2H)-dione