Heliotrine N-oxide is the pyrrolizidine alkaloid (PA) N-oxide counterpart of Heliotrine. It induces the generation of pyrrolic DNA adducts, potentially initiating PA-induced liver tumors in vivo.

7-hydroxycoumarinyl-γ-Linolenate is a γ-linolenic acid ester of 7-hydroxycoumarin (umbelliferone) that behaves as a substrate for cPLA2. Hydrolysis of 7-hydroxycoumarinyl-γ-linolenate by phospholipase results in the release of the fluorescent compound 7-hydroxycoumarin which can be monitored spectrophotometrically (excitation at 335 nm, emission at 450 nm).

Hirudonucleodisulfide A is a heterocyclic compound that can be found in Whitmania pigra. Hirudonucleodisulfide A shows moderately anti-anoxic activity.