Abstract
Two new compounds callistephus A (1) and callistephus B (2) together with 4,6-dihydroxyphenyl-1-butanone-2-β-d-O-glucopyranoside (3), were isolated and purified from the Callistephus chinensis flower. Their structures were identified by the interpretation of spectroscopic data. X-ray crystallographic and analysis of quantum chemical ECD calculation were applied to determine the absolute configuration. Of them, callistephus A represents a rare sesquiterpene with new carbon skeleton and also its possible biogenesis was proposed.
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