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The bitter principles of Physalis alkekengi var. Francheti, physalin A and physalin B, have been isolated and shown to possess the novel 13,14-seco-16,24-cyclo-24-methyl-steroid structures (Ia) and (VIII).
T. Matsuura, M. Kawai, R. Nakashima and Y. Butsugan, J. Chem. Soc. C, 1970, 664 DOI: 10.1039/J39700000664
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