“…7, 5]dioxocino [3,2-c:7,6-c'] -7,15-diphenyl-7,15-epoxy[1,5]dioxocino [3,2-c:7,6c']dichromene-6,14(7H,15H)-dione (7 c). R f = 0.5 (10% EtOAc/hexanes); white solid; 99 mg; yield 67%; mp 304-306 °C; 1 H NMR (CDCl 3 , 400 MHz) δ 8.12 (d, J = 2.4 Hz, 2H), 7.86-7.83 (m, 4H), 7.61 (dd, J = 8.8, 2.4 Hz, 2H), 7.50-7.49 (m, 6H), 7.27 (d, J = 8.0 Hz, 2H); 13…”