482-53-1 4H,8H-Benzo[1,2-b:3,4-b']dipyran-4-one, 5-hydroxy-3-(4-hydroxyphenyl)-8,8-dimethyl-6-(3-methyl-2-butenyl)- 4H,8H-Benzo[1,2-b:3,4-b']dipyran-4-one, 5-hydroxy-3-(p-hydroxyphenyl)-8,8-dimethyl-6-(3-methyl-2-butenyl)- NSC21565 OSAJIN