Synonyms: Spiro(5H-(1)benzopyrano(2,3-d)pyrimidine-5,1'(3'H)-isobenzofuran)-3'-one, 2-(dibutylamino)-8-(diethylamino)-4-methyl-;2-(Dibutylamino)-8-(diethylamino)-4-methylspiro(5H-(1)benzopyrano(2,3-d)pyrimidine-5,1'(3'H)-isobenzofuran)-3'-one;2'-(dibutylamino)-8'-(diethylamino)-4'-methyl-3H-spiro[2-benzofuran-1,5'-chromeno[2,3-d]pyrimidin]-3-one