Hypericin
Hypericin is a naphthodianthrone , an anthraquinone derivative which , together with hyperforin , is one of the principal active constituents of "Hypericum" ( Saint John's wort ) . 
<triplet> anthraquinone <subj> naphthodianthrone <obj> instance of <triplet> hyperforin <subj> Saint John's wort <obj> found in taxon <triplet> Hypericum <subj> Saint John's wort <obj> taxonomic type <triplet> Saint John's wort <subj> Hypericum <obj> parent taxon