Abstract
A new pseudoguaianolide named 11βH-dihydro-4-epineopulcehllin (1a) was isolated from the methanol extract of Gaillardia grandiflora. The stereostructure was determined on the basis of spectral evidence, especially proton nuclear magnetic resonance (including the 1H-1H correlation spectroscopy technique), and was confirmed by the transformation from neopulchellin (2a).
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