“…89 (s, 1H, OH), 12.10 (s, 1H, OH), 7.42 (d, J = 0.6 Hz, 1H, ArH), 7.09 (d, J = 0.6 Hz, 1H, ArH), 2.40 (s, 3H, CH 3 ) ppm. 13 C NMR (126 MHz, DMSO-d 6 , 25 2,4,5,7-tetrabromo-1,3,8-trihydroxy-6-methylanthracene-9,10-dione (E_4Br) [54]. N-Bromosuccinimide (890 mg, 5.0 mmol) was added to a solution of emodin (270 mg, 1.0 mmol) in THF (5 mL) and stirred for 24 h at room temperature.…”