Figure 5. Induction of apoptosis by 1a, 1b, 2a, and 2b antioxidants in CAL27, UMSCC1 and UMSCC47 oral squamous cell carcinoma lines as analyzed by the Annexin V assay. CT, control tissues; 1a, 1b, 2a, 2b, tissues treated with antioxidants. Antioxidants: 1a, 6′-hydroxy-2′,5′,7′,8′-tetramethylchroman-2′-yl) methyl 3,4,5-trihydroxybenzoate; 1b, 6′-hydroxy-2′,5′,7′,8′-tetramethylchroman-2′-yl) methyl 3,5-dimethoxy-4-hydroxycinnamate; 2a, N-decyl-N-(3,5-dimethoxy-4-hydroxybenzyl)-3-(3,4-dihydroxyphenyl) propanamide; 2b, N-decyl-N-(3-methoxy-4-hydroxybenzyl)-3-(3,4-dihydroxyphenyl) propanamide.