| Primary (First) - hazelnut roasted hazelnut |
| FL/FR | 2- | acetyl-3,5-dimethyl pyrazine |
| | odor: nutty roasted hazelnut |
| | flavor: nutty roasted hazelnut |
| FL | 3- | acetyl-2,5-dimethyl thiophene |
| | odor: burnt roasted meaty |
| | flavor: sweet dried hazelnut almond marzipan |
| FL | 2,5- | diethyl-3-methyl pyrazine |
| | odor: toasted hazelnut meaty |
| | flavor: hazelnut burnt |
| FL/FR | roasted | hazelnut infusions |
| | odor: nutty hazelnut |
| | flavor: nutty hazelnut |
| FL | european | hazelnut oleoresin |
| | flavor: nutty hazelnut |
| FL | 2- | methoxy-6-methyl pyrazine |
| | odor: roasted hazelnut almond peanut |
| Secondary (Second) - hazelnut roasted hazelnut |
| FL/FR | 2- | acetyl-3,5(or 6)-dimethyl pyrazine |
| | odor: nutty roasted hazelnut roasted peanut popcorn corn chip toasted grain nut flesh peanut butter |
| | flavor: nutty roasted hazelnut roasted peanut popcorn toasted grain nut flesh peanut butter |
| FL | | chocolate pyrazine B |
| | odor: nutty roasted hazelnut barly |
| Tertiary (Third) - hazelnut roasted hazelnut |
| FL/FR | 2- | acetyl-3,6-dimethyl pyrazine |
| | odor: popcorn roasted hazelnut caramellic |
| FL/FR | 2- | acetyl-3-methyl pyrazine |
| | odor: nutty nut flesh roasted hazelnut toasted grain corn chip vegetable nut skin caramellic |
| | flavor: nutty nut flesh roasted hazelnut toasted grain potato chip baked potato nut skin vegetable |
| Quaternary (Fourth) - hazelnut roasted hazelnut |
| FL/FR | 2- | methyl thio-3,5 or 6-methyl pyrazine |
| | odor: Toasted popcorn, roasted almond, hazelnut, peanut and cashew nutty, with a caramellic and corn-chip nuance |
| | flavor: Peanut and pecan nutty, popcorn and corn-chip-like with a burnt musty nuance |
| FL | 2- | pentyl thiophene |
| | odor: fatty chicken coup cranberry roasted hazelnut corn roasted barley fermented meaty bloody |
| | flavor: fatty chicken coup tropical nut flesh roasted barley fruity fermented minty |
| FL | | pyrazine |
| | odor: pungent sweet corn like roasted hazelnut barly |
| FL | 2- | thienyl disulfide |
| | odor: rubbery earthy mushroom |
| | flavor: earthy meaty |
| Quinary (Fifth) - hazelnut roasted hazelnut |
| FL/FR | | chocolate pyrazine A |
| | odor: chocolate cocoa roasted almond hazelnut peanut nutty |
| FL/FR | | hazelnut pyrazine |
| | odor: Musty, nut skin, earthy, toasted, potato bin, green and meaty |
| | flavor: Musty, toasted, nutty, potato, cocoa, earthy and dirty |
| Senary (Sixth) - hazelnut roasted hazelnut |
| Septenary (Seventh) - hazelnut roasted hazelnut |
| Octonary (Eighth) - hazelnut roasted hazelnut |