Abstract
Two new 4′-substituted flavones isolated from the fruit peels of Citrus limon (L.) Burm.f. (Rutaceae) have been characterized as 4′-(9′-ethylene-16′-methylnon-9′,15′-dien-7′,11′-oate)-5,7-dimethoxyflavone (limonflavonyl lactone A, 1) and 4′-(9′-ethylene-16′-methylnon-9′,15′-dien-7′,11′-oate)-5,7,3′-trimethoxyflavone (limonflavonyl lactone B, 2) on the basis of spectral data and chemical analyses. Both the flavones are reported for the first time from a plant source.