Polyoxygenated flavones from Ageratum conyzoides

摘要: Abstract Twelve polyoxygenated flavones have been isolated from Ageratum conyzoides, three of which are new natural flavones, namely ageconyflavones A (5,6,7-trimethoxy-3′,4′-methylenedioxyflavone), B (5,6,7,3′-tetramethoxy-4′-hydroxyflavone) and C (5,6,7,3′,5′-pentamethoxy-4′-hydroxyflavone). The other nine compounds were identified as linderoflavone B, eupalestin, nobiletin, 5′-methoxynobiletin, 5,6,7,5′-tetramethoxy-3′,4′-methylenedioxyflavone, sinensetin, 56,7,3′,4′,5′-hexamethoxyflavone, 5,6,7,8,3′-pentamethoxy-4′-hydroxyflavone 5,6,7,8,3′,5′-hexamethoxy-4′-hydroxyflavone.