130752-21-5 2,3-Dicarboxy-6,7-dihydroxy-1-(3',4'-dihydroxy)phenyl-1,2-dihydronaphthalene 2,3-Naphthalenedicarboxylic acid, 1-(3,4-dihydroxyphenyl)-1,2-dihydro-6,7-dihydroxy- KS I