*3.4. HPLC-PDA-ESI/MS Analysis*

The ethanolic extract of *Origanum compactum* was analyzed by high-performance liquid chromatography coupled to a photodiode array and electrospray ionization mass spectrometry (HPLC-PDA-ESI/MS). Identification of compounds was performed by using standard compounds (target identification) or by comparing mass spectrum obtained with literature data (tentative identification).
