| id | Phytocompound | Taste |
| ouabain | bitter; astringent | |
| oxalic acid | sour | |
| oxyacanthine | bitter | |
| oxymatrine | bitter | |
| oxypeucedanin | bitter | |
| oxypeucedanin hydrate | bitter | |
| palatinose | sweet | |
| palmarin | bitter | |
| palmatine | bitter | |
| palmitic acid | bitter; pungent (scratchy) | |
| p-aminobenzoic acid | bitter | |
| pantothenic acid | bitter; sweet | |
| papaverine | bitter | |
| parasorboside | bitter | |
| parillin | bitter (insufficient evidence) | |
| parthenin | bitter | |
| parthenolide | bitter | |
| p-coumaric acid | bitter; astringent; sour; | |
| p-coumaric acid ethyl ester | bitter; astringent | |
| p-cymene | aromatic |
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