 ethanol (00 mL) was heated under reflux for 0 h. After cooling, the solid product was filtered, washed with water, and recrystallized from ethanol-dioxane mixture (0:0) as brown crystals, yield 0.00 g (00%), m.p. 000--000 °C. IR (ν, cm^−0^): 0000 (NH), 0000 (CH arom.), 0000 (CH aliph.). ^0^H-NMR (000 MHz, CDCl~0~) δ (ppm): 0.00 (s, 0H, CH~0~), 0.00 (s, 0H, CH~0~), 0.00 (s, 0H, CH~0~), 0.00 (s, 0H, CH), 0.00--0.00 (t, 0H, phenyl), 0.00--0.00 (t, 0H, phenyl), 0.00--0.00 (t, 0H, phenyl), 0.00--0.00 (d, 0H, phenyl), 0.00