DL-3-aminoisobutyric acid monohydrate

<div class="line" id="line-5"> The title acid, 3-amino-2-methylpropanoic acid monohydrate, C <span style="font-size: 9px;"> 4 </span> H <span style="font-size: 9px;"> 9 </span> NO <span style="font-size: 9px;"> 2 </span> .H <span style="font-size: 9px;"> 2 </span> O, crystallized in the centrosymmetric space group&nbsp; <i> Pbca </i> &nbsp;in the zwitterionic form. The three H atoms on N, which are involved in hydrogen bonding, are ordered. The three intermolecular N-H <img src="http://scripts.iucr.org/logos/entities/ctdot_rmgif.gif"/> O hydrogen bonds have N <img src="http://scripts.iucr.org/logos/entities/ctdot_rmgif.gif"/> O distances ranging from 2.758&nbsp;(2) to 2.809&nbsp;(2)&nbsp;&Aring; and N-H <img src="http://scripts.iucr.org/logos/entities/ctdot_rmgif.gif"/> O angles ranging from 149&nbsp;(2) to 171&nbsp;(1)&deg;. The two intermolecular O- H <img src="http://scripts.iucr.org/logos/entities/ctdot_rmgif.gif"/> O hydrogen bonds have O <img src="http://scripts.iucr.org/logos/entities/ctdot_rmgif.gif"/> O distances 2.739&nbsp;(2) and 2.755&nbsp;(2)&nbsp;&Aring; and O- H <img src="http://scripts.iucr.org/logos/entities/ctdot_rmgif.gif"/> O angles 170&nbsp;(2) and 175&nbsp;(2)&deg;. Each acid molecule and its associated water molecule are directly hydrogen-bonded to five acid molecules and two water molecules; the structure comprises two subsets of molecules which are not cross-linked by these hydrogen bonds. Through basic second-level graphs, approximately two-thirds of the hydrogen-bonding patterns are finite and one-third are chains; there is a single ring pattern, which occurs about a center of symmetry.</div><div class="line" id="line-29"> <br/></div>