Taraxacin, a new guaianolide from Taraxacum wallichii.
A new guaianolide, taraxacin (1), and a known sesquiterpene ketolactone (2) have been isolated from an ethyl acetate-soluble part of a methanolic extract of Taraxacum wallichii. The structure of 1 was established using NMR, MS, and X-ray crystallographic methods. The (13)C NMR data of 2 is also being reported for the first time.
H.E.J. Research Institute of Chemistry, University of Karachi, Karachi-75270, Pakistan. viqar@khi.comsats.net.pk
V U
VU
Ahmad
S
S
Yasmeen
Z
Z
Ali
M A
MA
Khan
M I
MI
Choudhary
F
F
Akhtar
G A
GA
Miana
M
M
Zahid
D019659:Asteraceae / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006575:Heterocyclic Compounds, 3-Ring / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D013057:Spectrum Analysis
D006575:Heterocyclic Compounds, 3-Ring; C413041:taraxacin