| id | Phytocompound | Taste |
| arborine | bitter | |
| arbutin | bitter | |
| arctigenin | not bitter (arctigenin is the aglycon of a bitter compound, arctiin; arctigenin is not bitter) | |
| arctiin | bitter | |
| arctiopicrin | bitter | |
| arglabin | bitter | |
| aristolochic acid | bitter | |
| armatamide | pungent; sour; sweet; | |
| artabsin | bitter | |
| artabsinolide A | bitter | |
| artabsinolide B | bitter | |
| artabsinolide C | bitter | |
| artabsinolide D | bitter | |
| artecalin | bitter | |
| artemisiifolin | bitter (insufficient evidence) | |
| artemisin | bitter | |
| artemisinin | bitter | |
| artemorin | bitter | |
| arvenin I | bitter | |
| arvenin II | bitter |
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