Odors and odorants of the Grain Class
| almond | furfural |
| bitter almond | 4-acetyltoluene |
| bread | 2-acetylpyrrole furfural |
| fat | 2,4-heptadienal |
| nut | 2-acetylpyrrole 2,4-heptadienal acetylpyrroline |
| popcorn | methyl pyrazine |
| roast | acetylpyrroline |
| sweet | furfural |
| walnut | 2-acetylpyrrole |