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. 1999 Oct 12;96(21):11729–11734. doi: 10.1073/pnas.96.21.11729

Table 1.

GC/MS data for authentic standards

Compound Retention time, min Ions
5-Azauracil, IIb 5.3 257 (M+, 59%); 242 (54%); 143 (68%); 127 (31%); 100 (base peak)
Cyanuric acid, Ia 6.8 345 (base peak, M+); 330 (36%); 147 (44%); 100 (40%)
(2-Imino-5-oxo-imidazolidin-4-y)urea, IIred 9.0 517 (base peak, M+); 502 (22%); 428 (78%); 356 (33%)
Parabanic acid, III 5.8 258 (M+, 25%); 243 (76%); 215 (15%); 188 (5%); 100 (base peak)

The aglycons of the OONO−-reaction products of 3′,5′-di-O-Ac-8-oxodGuo are shown in bold type next to the authentic standard that gave an identical retention time and fragmentation pattern.