Other members include xanthene, which is found in tea, caffeine, and uric acid.  
The simplest member of this group, which also yields the whole group its name, is described by the chemical formula C5H4N4.  Other members include xanthene, which is found in tea, caffeine, and uric acid.  FTP, name this class heterocyclic organic compounds consisting of two rings of carbon and nitrogen atoms, the most famous of which are guanine and adenine.
The simplest member of this group, which also yields the whole group its name, is described by the chemical formula C5H4N4.  
Purines