| BRE | Boesenbergia rotunda rhizomes methanol extract |
| HPLC-PDA | High performance liquid chromatography-photodiode array detector |
| LC-MS | Liquid chromatography-mass spectrometry |
| eNOS | Endothelial nitric oxide synthase |
| ODQ | 1H- [1,2,4]oxadiazole [4,3-alpha]quinoxalin-1-one |
| L-NA | L-Nitroarginine |
| TEA | Tetraethylammonium |
| cGMP | Cyclic guanosine monophosphate |