(1)Benzopyrano(5,4,3-cde)(1)benzopyrano(5,4,3-cde)(1)benzopyran-5,10-dione, 2,3,7,8-tetrakis(acetyloxy)- 2,3,7,8-Tetrakis(acetyloxy)-(1)benzopyrano(5,4,3-cde)(1)benzopyrano(5,4,3-cde)(1)benzopyran-5,10-dione 4274-26-4