title: [Studies on CD spectra of derivatives of shikonin and alkannin].
abstract: The circular dichroism (CD) and electronic absorption spectra of seven derivatives of shikonin and alkannin isolated from the roots of Onosma confertum W.W. Smith (from Sichuan) and Arnebia euchroma (Royle) Johust (from Xinjiang) were described. Each pair of CD spectra obtained was exact mirror images and the UV spectra of these compounds were very similar. In comparison with the CD spectra of shikonin given in literature, the configuration of the pigments from Sichuan was assigned R and from Xinjiang were all S.
authors.affiliation: Department of Chemistry and Analytical & Testing Center, Sichuan University, Chengdu.
authors.forename: K H
authors.initials: KH
authors.lastname: Ai
authors.forename: J
authors.initials: J
authors.lastname: Jin
authors.forename: H
authors.initials: H
authors.lastname: Liu
mesh_terms: D002942:Circular Dichroism; D004365:Drugs, Chinese Herbal / Q000737:chemistry; D008968:Molecular Conformation; D009285:Naphthoquinones / Q000737:chemistry* / Q000302:isolation & purification; D013045:Species Specificity; D013237:Stereoisomerism
chemical_list: D004365:Drugs, Chinese Herbal; D009285:Naphthoquinones; C018204:alkannin; C016101:shikonin