title: Comments on 'Piperidone derivative from Dalbergia sympathetica'.
abstract: Alcoholic extraction of Dalbergia sympathetica leaves yielded N-methyl-trans-4-hydroxy-L-proline and not 3,6-dihydroxy-N-methyl-2-piperidone, as previously reported. This is shown by the identity of the 1H and 13C NMR data of the isolated compound with those of N-methyl-trans-4-hydroxy-L-proline.
authors.affiliation: Syngenta Crop Protection AG, CH 4002 Basel, Switzerland. tammo.winkler@syngenta.com
authors.forename: Tammo
authors.initials: T
authors.lastname: Winkler
mesh_terms: D002247:Carbon Isotopes / Q000032:analysis; D035782:Dalbergia / Q000737:chemistry*; D003903:Deuterium / Q000032:analysis; D006909:Hydroxyproline / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D010881:Piperidones / Q000737:chemistry* / Q000302:isolation & purification; D018515:Plant Leaves / Q000737:chemistry
chemical_list: D002247:Carbon Isotopes; D010881:Piperidones; C000716210:trans-4-hydroxy-L-proline; D003903:Deuterium; D006909:Hydroxyproline