Monoethyl malonic acid belongs to the class of organic compounds known as dicarboxylic acids and derivatives. These are organic compounds containing exactly two carboxylic acid groups. Monoethyl malonic acid exists as a solid soluble (in water) and a weakly acidic compound (based on its pKa).

Phaeocaulisin E (Compound 5) is a guaiane-type sesquiterpene that inhibits LPS HY-induced NO production in RAW 264.7 macrophages with an IC50 of 10.3 μM.

AHR antagonist 5 free base is an orally active AHR antagonist with IC50 of approximately 35-150 nM in human and rodent cell lines, and exhibits anticancer activity.