Return to Article Details 5H-benzimidazo[2′,1′:2,3][1,3]thiazino[6,5-<i>d</i>]-pyrimidine and benzimidazo[2,1-<i>b</i>]pyrimido[5,4-<i>f</i>][1,3,4]thiadazepine. Novel heterocyclic systems Download Download PDF