1,3,6-CYCLOHEPTATRIENE-1-CARBOXYLIC ACID, 3,6-DIHYDROXY-5-OXO- 3,6-Dihydroxy-5-oxo-1,3,6-cycloheptatriene-1-carboxylic acid 4-10-00-03859 (Beilstein Handbook Reference) 4440-39-5 BRN 2723909 Stipitatic acid