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On the basis of spectroscopic data and chemical evidence, the structure and absolute configuration of isodoacetal (1a), nodosinin (6), and odonicin (11) have been established. The first two are B-secokaurene derivatives and the third is ent-6α, 15α-diacetoxy-7β,20-epoxy-7α-hydroxykaura-2,16-dien-1-one. Chemical interconversions between isodoacetal and nodosinin have been accomplished.
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Fujita et al. (1973) studied this question.
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