Some imidazo-1,2,3,-triazines and their biological relationship to the purines.
D006801:Humans; D007093:Imidazoles; D011687:Purines; D014227:Triazines
D007093:Imidazoles; D011687:Purines; D014227:Triazines; C030985:purine
IMIDAZOLES; PURINES; TRIAZINE