The structures of two new lignan constituents of Heliopsis scabra, helianthoidin and helioxanthin, have been determined by spectral and degradative work. The former is shown to be 2-angelyloxy-2-piperonyl-3-veratryl-2S,3S-γ-butyrolactone (I), and the latter 1-(3,4-methylenedioxyphenyl)-2-hydroxymethyl-7,8-methylenedioxy-3-naphthoic acid lactone (XVII).
R. S. Burden, L. Crombie and D. A. Whiting, J. Chem. Soc. C, 1969, 693 DOI: 10.1039/J39690000693
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