Cyathin B3, a metabolite of Cyathus helenae is shown to possess structure 3a. Cyathin C3 is 1,2-dehydrocyathin B3 (4a). Cyathin B3 has been correlated with cyathin A3 (1) and cyathin C3 with allocyathin B3 (2).
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Ayer et al. (1973) studied this question.
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