6H-benzofuro[3,2-c][1]benzopyran-6-one, 8,9-dihydroxy-10-methoxy- 8,9-dihydroxy-10-methoxy-6H-[1]benzofuro[3,2-c]chromen-6-one InChI=1/C16H10O6/c1-20-15-12(18)9(17)6-8-11-13(22-14(8)15)7-4-2-3-5-10(7)21-16(11)19/h2-6,17-18H,1H