4H-1-benzopyran-4-one, 2,3-dihydro-5,7-dihydroxy-3-[(4-hydroxyphenyl)methyl]- 5,7-dihydroxy-3-(4-hydroxybenzyl)-2,3-dihydro-4H-chromen-4-one InChI=1/C16H14O5/c17-11-3-1-9(2-4-11)5-10-8-21-14-7-12(18)6-13(19)15(14)16(10)20/h1-4,6-7,10,17-19H,5,8H