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Secoscabronine M (1) is a hemiacetal cyathane diterpenoid that was isolated from the fruiting bodies of the basidiomycete Sarcodon scabrosus (Fr.) Karst. Compound 1 possesses a novel structure with a bond cleavage between C-3 and C-4. The structure of the new compound was elucidated by means of spectroscopic methods, including two-dimensional nuclear magnetic resonance experiments. The absolute configuration of 1 was established by analysis of circular dichroism spectroscopy and also by employing time-dependent density functional theory calculations. In addition, compound 1 was confirmed to be an equilibrium mixture of two epimers (15S and 15R) at position C-15 in polar solvents by one-dimensional nuclear magnetic resonance analysis.
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Shi et al. (2012) studied this question.
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