5, 6'-Dihydroxy-2', 3', 4', 6, 7-pentamethoxy-(1), 2', 5-dihydroxy-3', 4', 6, 6', 7-pentamethoxy-(2) and 3', 5-dihydroxy-2', 4', 6, 6', 7-pentamethoxyflavone (3) were synthesized to compare with brickellin isolated from Brickellia veronicaefolia and B. chlorolepis. The spectral properties of these synthetic flavones were not consistent with those of brickellin.
