Ambrosanolides and other constituents of two rudbeckia species.
Aerial parts of RUDBECKIA SUBTOMENTOSA Pursh furnished four C-15 functionalized ambrosanolides, one of them new, as well as coumarin. Aerial parts of RUDBECKIA TRILOBA L. var. TRILOBA furnished coumarin and two closely related thiopheneacetylenes.
Gutiérrez
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Department of Chemistry, The Florida State University, Tallahassee, Florida 32306, USA.
Herz
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