“…13 C-NMR (DMSO-d 6 , 100 MHz) δ (ppm) 168. 8, 167.1, 157.3, 147.9, 120.3, 118.6, 118.5, 110.3, 13.7 4.17 | (Z)-5-(4-hydroxy-3-methoxybenzylidene)pyrimidine-2,4,6 (1H,3H,4H)trione (14) [42,43] Orange solid obtained after 1 h at 60 C in 77% yield (104 mg). Mp = 288 C. 1 H-NMR (DMSO-d 6 ,400 MHz): δ…”