| 3CL | Main SARS-CoV-2 protease |
| GC-MS | Gas chromatography–mass spectrometry |
| mg % | mg/100 g of raw material |
| MTBE | Methyl-tert-butyl ether |
| MTBE-extract | Extract obtained with MTBE as extractant |
| MTBE/Hexane-extract | Extract obtained with MTBE after hexane extraction |
| Nd | Not detected |
| RT | Retention time |
| IC50 | Half-inhibitory concentration |
| CentL | Aerial part (leaves with stems) of Centaurea scabiosa L. |
| Centinflor | Centinflor inflorescences of C. scabiosa L. |
| Cent-roots | Roots of C. scabiosa L. |
| Et | Ethanol |
| UR | Unsaponifiable residue |
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