5-Hydroxy-2,2-dimethyl-2,8-dihydro-6H-furo[3,4-g]chromen-6-one 6H-furo[3,4-g]-1-benzopyran-6-one, 2,8-dihydro-5-hydroxy-2,2-dimethyl- 9-Hydroxy-6,6-dimethyl-3,6-dihydro-2,5-dioxa-cyclopenta[b]naphthalen-1-one InChI=1/C13H12O4/c1-13(2)4-3-8-9(17-13)5-7-6-16-12(15)10(7)11(8)14/h3-5,14H,6H2,1-2H