title: v-Triazolo[4,5-d]pyrmidines (8-azapurines). Part 18. Three new reactions for synthesizing 8-azapurinethiones from 4-amino-5-cyano-1,2,3-triazoles.
mesh_terms: D001372:Aza Compounds / Q000138:chemical synthesis*; D007536:Isomerism; D011687:Purines / Q000138:chemical synthesis*; D011743:Pyrimidines; D013871:Thiones / Q000138:chemical synthesis; D014230:Triazoles
chemical_list: D001372:Aza Compounds; D011687:Purines; D011743:Pyrimidines; D013871:Thiones; D014230:Triazoles