title: 2-(5-Amino-2H-tetra-zol-2-yl)acetic acid.
abstract: In the title mol-ecule, C(3)H(5)N(5)O(2), the tetra-zole ring and carboxyl group form a dihedral angle of 82.25 (14)°. In the crystal, adjacent mol-ecules are linked through O-H⋯N, N-H⋯O and N-H⋯N hydrogen bonds into layers parallel to the bc plane.
authors.forename: Guo-Chun
authors.initials: GC
authors.lastname: Zhang
authors.forename: Cheng-Fang
authors.initials: CF
authors.lastname: Qiao
authors.forename: Chun-Sheng
authors.initials: CS
authors.lastname: Zhou
authors.forename: Zheng-Qiang
authors.initials: ZQ
authors.lastname: Xia