| id | Phytocompound | Taste |
| nortracheloside | bitter | |
| noscapine | bitter | |
| N-trans-feruloyl-3-methoxytyramine | bitter; pungent | |
| N-trans-feruloyldopamine | bitter; pungent | |
| nuezhenide | bitter | |
| nupharidine | bitter | |
| obacunoic acid | bitter | |
| obacunone | Bitter (contradictory evidence): bitter, non bitter; | |
| octahydrovernodalin | bitter | |
| octanal | bitter | |
| officinalisnin II | bitter | |
| oleandrin | bitter | |
| oleic acid | bitter, pungent; pungent (scratchy), astringent | |
| oleocanthal | Pungent (burning); bitter; astringent; | |
| oleuropein | bitter | |
| oleuropein aglycone | bitter; pungent | |
| ononin | bitter; astringent; | |
| orcinol | sweet | |
| oridonin | bitter | |
| osladin | sweet |
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