Hypoprotocetraric acid

3,8-Dihydroxy-1,4,6,9-tetramethyl-11-oxo-11H-dibenzo[b,e][1,4]dioxepin-7-carboxylic acid

1,4,6,9-Tetramethyl-3,8-dihydroxy-11-oxo-11H-dibenzo[b,e][1,4]dioxepin-7-carboxylic acid