Li Gong-Chun, Wang Li-Ye, Zhu Ran, Yang Feng-Ling
Acta Crystallogr Sect E Struct Rep Online. 2008 Nov 8;64(Pt 12):o2264. doi: 10.1107/S1600536808035538.
The title compound, C(7)H(9)N(3)O(2), was prepared by alkaline hydrolysis of ethyl 1-allyl-3-amino-1H-pyrazole-4-carboxyl-ate. The crystal structure is stabilized by three types of inter-molecular hydrogen bond (N-H⋯O, N-H⋯N and O-H⋯N).