11H-Dibenzo(b,e)(1,4)dioxepin-7-carboxylic acid, 4-formyl-3,8-dihydroxy-9-(hydroxymethyl)-1,6-dimethyl-11-oxo- 4-Formyl-3,8-dihydroxy-9-(hydroxymethyl)-1,6-dimethyl-11-oxo-11H-dibenzo(b,e)(1,4)dioxepin-7-carboxylic acid 489-51-0