2-Amino-5-methyl-1,2,4-triazolo[1,5-a]pyrimidin-7(4H)-one

The asymmetric unit of the title compound, C6H7N5O, consists of two mol­ecules with almost identical conformations. In the crystal, inversion dimers linked by pairs of N—H⋯N hydrogen bonds occur for both mol­ecules; further N—H⋯N and N—H⋯O hydrogen bonds connect the dimers into a three-dimensional network.