(4R)-4-Hydroxy-1-[(2S)-2-hydroxydodecyl]-L-proline monohydrate

The title compound, C17H33NO4·H2O, was found to be the S diastereoisomer with respect to the asymmetric C atom at the OH group on the chain. The X-ray structure was determined as part of a study of the mol­ecular geometry and stereochemistry of l-proline derivatives for pre-coating thin-layer chromatography plates intended for enantiomeric separation.