spectrum. As also H-1 was coupled to the same hydrogen pair,
the absence of oxygenation at C-2 was proved.
1H NMR spectra of compounds eluted with peaks 6, 7, 10, and
12 exhibited features characteristic of phenylpropanoids previously
isolated from Thapsia species.46,47 Thus, all spectra exhibited the presence of a methoxy group (ä 3.91), a methylenedioxy group
(ä 5.96), and two meta-coupled hydrogen resonances