sentence: Active larvicidal constituents ( LC < 50 mg / L ) derived from plants include alkaloids ( e.g ., retrofractamide A and three isobutylamides , 0.004 – 0.86 mg / L ) , terpenoids ( e.g ., 9-oxoneoprocurcumenol and neoprocurcumenol , 5.81 and 13.69 mg / L ) , coumarins ( e.g ., imperatorin and eight coumarins , 2.88 – 44.39 mg / L ) , flavonoids ( e.g ., karanjin , karanjachromene , pongamol , and pongarotene , 14.61 – 37.61 mg / L ) , phenylpropanoids ( e.g ., ethyl p-methoxycinnamate , 12.3 – 20.7 mg / L ) , lignans ( e.g ., ( − ) - asarinin , 10.49 – 16.49 mg / L ) , neolignans ( e.g ., burchellin , 15.5 mg / L ) , cyanogenic glycosides ( e.g ., dhurrin , 12 mg / L ) , lactones ( e.g ., butenolides 1 and 2 , 0.41 and 0.47 mg / L ) , acetylenic alcohols ( e.g ., falcarinol and falcarindiol , 3.49 and 6.51 mg / L ) , and fatty acids ( e.g ., oleic acid and palmitic acid , 18.07 – 18.45 and 34.50 – 42.96 mg / L ) .