Table 2. IC₅₀ Values of SIQs against Cancer Cell Lines A549, A431, and Vero.

	IC50 (μM)
compounds	A549	A431	Vero
SIQ3	33.54 ± 0.47	17.67 ± 0.35	>100
SIQ5	16.84 ± 0.41	9.93 ± 0.45	8.06 ± 0.15
SIQ8	27.23 ± 0.71	14.10 ± 0.73	21.74 ± 0.50
SIQ12	23.25 ± 0.42	13.10 ± 0.50	7.25 ± 0.12
SIQ17	32.98 ± 0.59	19.17 ± 0.97	>100
SIQ19	29.31 ± 0.44	11.90 ± 0.41	5.88 ± 0.33
erlotinib	33.28 ± 1.88	20.57 ± 5.43	35.02 ± 1.35