Researchers analyzed the chemical properties of two plants, Verbascum conocarpum and Scrophularia trifoliata, native to Sardinia. They focused on specific chemical markers found in the iridoids aucubin, verbascoside, and catalpol, which are commonly found in plants of the Scrophulariaceae family. This study helps to identify these plants and their unique chemical makeup, which can aid in future research and potential medicinal uses.