“…The precipitate was collected to give NPT (2.33 g, 9.4 mmol) in a yield of 94%. DSC (5 1C min À1 ) 274.1 1C(dec); IR (KBr, cm À1 ) 3478,3320,3021,1610,1560,1525,1488,1421,1362,1284,1160,778,685,654; 1 H NMR (400 MHz, DMSO-d 6 ) d 9.77 (s, 1H), 9.13 (s, 1H) ppm, 13 C NMR (100 MHz, DMSO-d 6 ) d 163. 5, 155.0, 154.7, 153.6, 147.8, 93.7 2,4]triazolo[5 0 ,1 0 : 2,3]pyrimido[4,5d][1,2,3]triazine 2-oxide (TPTO).…”