From North Carolina Helenium autumnale L. (Compositae, Japanese name : dangogiku), new sesquiterpene lactones, 3-O-tigloylcarolenalin (4), 11, 13-dehydrocarolenalin (5), carolenalin-4-O-β-D-glucoside (7), 3-O-tigloylcarolenalone (10), 3-O-angeloylcarolenalone (11), carolenalol (12), 4-O-tigloyl-11, 13-dihydroautumnolide (14), 6-O-angeloylplenolin (15) and 11, 13-dihydroarnifolin (19) were isolated along with some known components, carolenalin (1), carolenin (3) and carolenalone (9), and their structures were proposed on the basis of spectral and chemical evidence.
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Itoigawa et al. (1981) studied this question.