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1.  7-Amino-5-methyl-2-phenyl-6-(phenyl­diazenyl)pyrazolo[1,5-a]pyrimidine crystallizes with Z′ = 2: pseudosymmetry and the formation of complex sheets built from N—H⋯N and C—H⋯π(arene) hydrogen bonds 
The title compound, C19H16N6, crystallizes with Z′ = 2 in the space group P21/n. The two mol­ecules in the selected asym­metric unit are approximate mirror images of one another; most corresponding pairs of atoms are related by an approximate half-cell translation along [100]. Each mol­ecule contains an intra­molecular N—H⋯N hydrogen bond and the mol­ecules are linked into complex sheets by a combination of two inter­molecular N—H⋯N and four C—H⋯π(arene) hydrogen bonds. Comparisons are made with some other 7-amino­pyrazolo[1,5-a]pyrimidines.
doi:10.1107/S0108270110003549
PMCID: PMC2855586  PMID: 20203410

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