*3.2. Extraction of Essential Oil*

The fresh aerial parts (leaves, stems, and flowers) of *O. suffruticosum* were subjected to hydrodistillation using the Clevenger-type apparatus for 3 h as per the European Pharmacopeia's guidelines [60]. The essential oil was recovered by decantation in glass vials and stored in the dark at 4 ◦C until further use. The oil yield was expressed as the average percentage of volume in mL per weight in g (% *v/w*) of triplicate analyses.
