Aspecioside, a 7β,8β-epoxycardenolide glycoside isolated from Asclepias speciosa(Asclepiadaceae), has been shown by 400 MHz 1H n.m.r., 13C n.m.r., mass spectrometry, and biogenetic considerations to be 12β-hydroxy-5α-tanghinigenin-3-(6-deoxy-β-D-allopyranoside). It is also found in A. syriaca.
H. T. A. Cheung, T. R. Watson, S. M. Lee, M. M. McChesney and J. N. Seiber, J. Chem. Soc., Perkin Trans. 1, 1986, 61 DOI: 10.1039/P19860000061
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