The structures of two new C28 steroidal lactones have been established; an X-ray diffraction analysis of acnistin E shows that it has a novel side chain with the C-21 methyl group fused to the lactone ring.
A. Usubillaga, G. de Castellano, V. Zabel and W. H. Watson, J. Chem. Soc., Chem. Commun., 1980, 854 DOI: 10.1039/C39800000854
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