1,2-Benzenedicarboxylic acid, 1,1'-(ursa-9(11),12-diene-3,28-diyl) ester, disodium salt, 146029-91-6 Ursa-9(11),12-diene-3,28-diol, bis(hydrogen 1,2-benzendicarboxylate), disodium salt, (3-beta)-