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


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


RESULTS
Two anthraquinone were isolated from Knoxia valerianoides Thorel et Pitard and identified as 1,3,5-trihydroxy-2-ethoxymethyl-6-methoxyl-anthraquinone (I) and 1,3-dihydroxy-2-ethoxymethyl-anthraquinone (II).


CONCLUSIONS
The compound I was found to be a novel anthraquinone constituent and II was isolated from Knoxia valerianoides Thorel et Pitard for the first time.
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*; D015394:Molecular Structure; D035281:Plant Tubers / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D019666:Rubiaceae / Q000737:chemistry*
C514827:1,3,5-trihydroxy-2-ethoxymethyl-6-methoxyl-anthraquinone; C514828:1,3-dihydroxy-2-ethoxymethyl-anthraquinone; D000880:Anthraquinones