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Seven new triterpenoids from the heartwood of Guarea glabra are formulated as (1)–(5), (14), and (26) on the basis of chemical, spectroscopic, and X-ray evidence. All are based on the novel pentacyclic triterpane skeleton, (20S)-4,4,8β-trimethyl-14,18-cyclo-5α,13α,14α,17α-cholestane (16).
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Ferguson et al. (1975) studied this question.
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