2,3-naphthalenediol, 6-(3,4-dihydroxyphenyl)- 6-(3,4-dihydroxyphenyl)naphthalene-2,3-diol InChI=1/C16H12O4/c17-13-4-3-10(6-14(13)18)9-1-2-11-7-15(19)16(20)8-12(11)5-9/h1-8,17-20