4H-1-benzopyran-4-one, 5,7-dihydroxy-3-[4-(methylsulfonyl)phenyl]- 5,7-dihydroxy-3-[4-(methylsulfonyl)phenyl]-4H-chromen-4-one InChI=1/C16H12O6S/c1-23(20,21)11-4-2-9(3-5-11)12-8-22-14-7-10(17)6-13(18)15(14)16(12)19/h2-8,17-18H,1H