Table 2.

Efflux pump inhibitory activities of compounds isolated from C. trifoliata.

Compound	Concentration (μM)	FL-1	FAR
Tariquidar	0.2	88.20	11.44
imperatorin (1)	2	11.30	1.47
	20	9.82	1.27
phellopterin (2)	2	11.10	1.44
	20	20.30	2.63
scoparone (3)	2	8.01	1.04
	20	15.60	2.02
myrsellin (4)	2	10.90	1.41
	20	37.50	4.86
auraptene (5)	2	13.60	1.76
	20	30.80	4.00
triphasiol (6)	2	14.20	1.84
	20	14.30	1.85
limonin (9)	2	2.92	0.38
	20	10.00	1.30
deacetyl nomilin (10)	2	4.61	1.01
	20	3.53	0.78

FL-1: mean fluorescence intensity of the cells; FAR: fluorescence activity ratio.