ChemInform Abstract: Synthesis of Novel Heterocycle Systems: 6, 8‐Dimethyl‐2‐(methylsulfanyl)‐4‐amino‐substituted Pyrimido[4′, 5′:3, 4]pyrazolo[1, 5‐a]pyrimidine and 9, 11‐Dimethyl‐5‐(methylsulfanyl)pyrimido[2′, 1′:5, 1]pyrazolo[4, 3‐e] [1, 2, 4]triazolo[4, 3‐c]pyrimidine. Issue 23 (June 2015)