A hydrogen-bonded chain of rings in 7-amino-5-tert-butyl-2-methylpyrazolo[1,5-a]pyrimidine, and a hydrogen-bonded framework structure in 3,7-diamino-2,5-dimethylpyrazolo[1,5-a]pyrimidine monohydrate

In 7-amino-5-tert-butyl-2-methylpyrazolo[1,5-a] pyrimidine, C11H16N4, which crystallizes with Z' = 2 in the space group P (1) over bar, the independent molecules are linked by four N-H center dot center dot center dot N hydrogen bonds into chains containing three types of ring. In 3,7-diamino-2,5-dimethylpyrazolo[1,5-a] pyrimidine monohydrate, C8H11N5 center dot H2O, the molecular components are linked into a three-dimensional framework structure by a combination of O-H center dot center dot center dot N, N-H center dot center dot center dot N and N-H center dot center dot center dot O hydrogen bonds.