title: (R,S)-3-Carb-oxy-2-(isoquinolinium-2-yl)propanoate monohydrate.
abstract: The title compound, C(13)H(11)NO(4)·H(2)O, is a monohydrate of a betaine exhibiting a positively charged N-substituted isoquino-line group and a deprotonated carboxyl group. In the crystal, mol-ecules are connected via short O-H⋯O hydrogen bonds between protonated and deprotonated carboxyl groups into chains of either R or S enanti-omers along [001]. These chains are additionally connected by hydrogen bonding between water mol-ecules and the deprotonated carb-oxy groups of neighbouring mol-ecules.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Stilinović
authors.forename: Leo
authors.initials: L
authors.lastname: Frkanec
authors.forename: Branko
authors.initials: B
authors.lastname: Kaitner