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The structure of a fernane isolated from S. brasiliensis was established as fern-7en-3α-ol, C30H50O. Rings A and D assume a chair conformation, while rings B and C adopt a twist-boat conformation. Rings A/B, C/D, and D/E are trans fused. The relative orientation of the hydroxy group and that of the isopropyl group is α.
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Khera et al. (2003) studied this question.
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