109640-80-4 3'-Diethylamino-2'-dibutylamino-8'-methyl-5',7'-diazaspiro(phthalon-1,9'-xanthene) Spiro(5H-(1)benzopyrano(2,3-d)pyrimidine-5,1'(3'H)-isobenzofuran)-3'-one, 7-(dibutylamino)-8-(diethylamino)-4-methyl-