The Chemistry of Caffeine - Caffeine: Chemistry, Analysis, Function and Effects - page 45

Table 3.2 Caffeine, xanthines, and the purine structure.

Compound CAS no. Structure

Caffeine 58-08-2

1,3,7-Trimethylxanthine

d n 0 t 2 n g | 1

Theophylline 58-55-9

1,3-Dimethylxanthine

Theobromine 83-67-0

3,7-Dimethylxanthine

Paraxanthine 611-59-6

1,7-Dimethylxanthine

Xanthine 69-89-6

Purine 120-73-0