1-Azaniumylcyclobutane-1-carboxylate monohydrate

Abstract

In the title compound, C5H9NO2·H2O, the amino acid is in the usual zwitterionic form involving the α-carboxyl­ate group. The cyclo­butane backbone of the amino acid is disordered over two conformations, with occupancies of 0.882 (7) and 0.118 (7). In the crystal, N—H⋯O and O—H⋯O hydrogen bonds link the zwitterions [with the water molecule involved as both acceptor (with the NH3 +) and donor (through a single carboxylate O from two different aminocyclobutane carb­oxylate moities)], resulting in a two-dimensional layered structure lying parallel to (100).