... Journal of Natural ... p-Bromobenzoate of 2 (2a): mp 189−190 °C; 1 H NMR (CDCl 3 ) δ 7.29 (1H, s, H-1), 6.39 (1H, s, H-4), 4.27 (1H ... All stock cultures were grown in T-25 flasks (5 mL of RPMI-1640 medium supplemented with 25 mM HEPES, 0.25% sodium bicarbonate, 10% fetal ...