7H-furo[3,2-g][1]benzopyran-7-one, 9-hydroxy- 9-hydroxy-7H-furo[3,2-g]chromen-7-one InChI=1/C11H6O4/c12-8-2-1-6-5-7-3-4-14-10(7)9(13)11(6)15-8/h1-5,13