Pyridine-2,5-diamine.

In the title mol-ecule, C5H7N3, intra-cyclic angles cover the range 117.15†(10)-124.03†(11)°. The N atoms of the amino groups have trigonal-pyramidal configurations deviating slightly from the pyridine plane by 0.106†(2) and -0.042†(2)†à . In the crystal, the pyridine N atom serves as an acceptor of an N-H⋯N hydrogen bond which links two mol-ecules into a centrosymmetric dimer. Inter-molecular N-H⋯N hydrogen bonds between the amino groups further consolidate the crystal packing, forming a three-dimensional network.