Structure of aspecioside from the monarch butterfly larvae foodplants Asclepias speciosa and A. syriaca
Abstract
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.