[Chemical constituents of Knoxia valerianoides].
OBJECTIVE
To study the chemical constituents of Knoxia valerianoides Thorel et Pitard.


METHODS
Chromatographic methods were used for the isolation and purification. Structures were elucidated on the basis of chemical analysis and spectroscopic data.


RESULTS
Three anthraguinones were isolated from K. valerianoides and identified as 1, 3, 5-trihydroxy-2-methyl-6-methoxyl-anthraguinone (kaoxiadin, I), 1, 3, 6-trihydroxy-5-ethoxylmethyl-anthraguinone (II) and 1, 3-dihydroxy-2-methylanthraguinone (rubiadin, III).


CONCLUSIONS
Compound II is a new anthraguinone constituent.
Yuan
Shan-qin
SQ
Institute of Pharmacology and Toxicology, Academy of Military Medical Sciences, Beijing 100850, China.
Zhao
Yi-min
YM
D000880:Anthraquinones / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D035281:Plant Tubers / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D019666:Rubiaceae / Q000737:chemistry*
D000880:Anthraquinones; C526424:kaoxiadin; C072500:rubiadin