title: [Three cyclic dipeptides from the root of Psammosilene tunicoides].
abstract: OBJECTIVE
  [corrected] To study the cyclic peptides from Psammosilene tunicoides.
  
  
  METHODS
  The constituents were separated and purified with chromatographic methods, identified by NMR, MS, UV and IR.
  
  
  RESULTS
  Three cyclic dipeptides: cyclo(-Pro-Val-) (1), cyclo(-Pro-Ala-) (2) and cyclo(-Pro-Pro-) (3), were isolated and identified.
  
  
  CONCLUSIONS
  Compound 1 and 2 are new natural products, compound 3 was isolated for the first time from Psammosilene tunicoides.
authors.affiliation: Department of Chemistry, Yunnan University, Kunming 650091, Yunnan, China. ztdng@ynu.edu.cn
authors.forename: Zhong-tao
authors.initials: ZT
authors.lastname: Ding
authors.forename: Zhi-juan
authors.initials: ZJ
authors.lastname: Bao
authors.forename: Xue-qiong
authors.initials: XQ
authors.lastname: Yang
authors.forename: Ming
authors.initials: M
authors.lastname: Jiang
mesh_terms: D029748:Caryophyllaceae / Q000737:chemistry*; D004151:Dipeptides / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D010456:Peptides, Cyclic / Q000737:chemistry / Q000302:isolation & purification*; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*
chemical_list: D004151:Dipeptides; D010456:Peptides, Cyclic; C448039:prolyl-proline; C034446:prolylvaline