Table 3.

IC₅₀ (μg/mL) values of PS1 and 2a–2e against A549 cells at various incubation times. IC₅₀ values were determined by MTT assay at 3 h, 24 h and 48 h incubation after photo irradiation.

Compound	3 h	24 h	48 h
1	14.8	10.5	8.72
2a	7.14	5.32	4.32
2b	12.06	7.24	6.38
2c	20.53	14.43	13.05
2d	20.52	18.51	12.95
2e	24.23	22.12	11.82