| Primary (First) - bitter |
| FR | | artemisia alba oil |
| | odor: powerful bitter herbal green |
| FL/FR | | cocoa absolute |
| | odor: cocoa bitter powdery milky |
| | flavor: cocoa |
| FL/FR | | cocoa oleoresin |
| | odor: dark bitter cocoa chocolate powdery earthy coffee roasted |
| | flavor: bitter powdery cocoa earthy |
| FR | 2- | ethyl-N-methyl-N-(3-methyl phenyl) butyramide |
| | odor: bitter tropical grapefruit rhubarb guava |
| FL/FR | | gentian absolute |
| | odor: bitter vegetable herbal dry woody |
| FR | | gentian concrete |
| | odor: bitter earthy rooty |
| | | mistletoe absolute |
| | odor: bitter herbal green foliage bark |
| FR | | mistletoe fragrance |
| FR | | pelargonium radula oil |
| | odor: bitter leafy woody earthy palmarosa |
| FL/FR | | propyl isovalerate |
| | odor: bitter sweet apple fruity |
| FR | | saffron pyranone |
| | odor: bitter walnut nutty nut skin acorn saffron citrus herbal hot |
| | flavor: woody old wood nutty |
| Secondary (Second) - bitter |
| FL/FR | | clary sage concrete |
| | odor: rich sweet bitter wine herbal |
| | flavor: clary sage |
| FR | | cocoa fragrance |
| | 2- | ethyl-4-isopropenyl pyridine |
| | odor: nutty bitter herbal |
| FL/FR | 3- | heptanol |
| | odor: powerful herbal |
| FR | | hop fragrance |
| FR | | orange leaf water absolute |
| | odor: green bitter sweet floral |
| Tertiary (Third) - bitter |
| FR | | chocolate fragrance |
| FL | | cocoa pyrazines base (mixture of pyrazines) |
| | odor: nutty bitter chocolate |
| | flavor: bitter nutty chocolate |
| FR | | dimethyl octenone |
| | odor: bitter grapefruit fresh fruity |
| FR | | grapefruit fragrance |
| FL/FR | | grapefruit oil c.p. california |
| | odor: sweet dry citrus bitter aldehydic terpenic fruity tropical orange |
| | flavor: grapefruit |
| FL/FR | | grapefruit oil replacer |
| | odor: grapefruit |
| | flavor: grapefruit |
| FL/FR | bitter | orange peel oil brazil |
| | odor: citrus orange dry woody mandarin cognac terpenic aromatic |
| | flavor: Bitter, fruity, Madeira, cognac and woody with aromatic nuances |
| FL/FR | | tagete oil egypt |
| | odor: rancid fruity bitter apple chamomile |
| | flavor: tagette |
| FL/FR | | tagete oil rwanda |
| | odor: rancid fruity bitter |
| | flavor: tagette |
| Quaternary (Fourth) - bitter |
| FR | mountain | ash berry fragrance |
| | odor: herbal citrus tart bitter |
| FL/FR | | beer CO2 extract |
| | odor: animal fresh yeasty bitter |
| | flavor: beer |
| FL/FR | | coriander oil fractions |
| | odor: coriander marine |
| | flavor: coriander |
| FR | | cranberry fragrance |
| FR | | elder berry fragrance |
| | | eucalyptus numerosa type oil |
| | odor: fresh peppery spicy minty bitter terpene |
| FL | | quassia amara bark extract |
| | odor: woody phenolic animal bitter chemical burnt medicinal balsamic |
| | flavor: bitter astringent medicinal fruity herbal green earthy |
| Quinary (Fifth) - bitter |
| FL | | acetyl acetaldehyde dimethyl acetal |
| | odor: ethereal musty nutty alcoholic bitter |
| FL/FR | | marigold oil mexico |
| | flavor: marigold |
| FL/FR | | petitgrain oil terpeneless |
| | odor: floral citrus peel clary sage sweet woody bitter |
| | flavor: sweet citrus peel clary sage floral bergamot herbal citrus rind tropical woody |
| FR | | rose pyran |
| | odor: rose fresh green herbal phenolic bitter parsley |
| Senary (Sixth) - bitter |
| FR | | apple cranberry fragrance |
| FR | | armoise oil |
| | odor: fresh cedarleaf minty camphor sage herbal bitter-sweet |
| Septenary (Seventh) - bitter |
| FR | | cucumber fragrance |
| FL | | peanut oxazole |
| | odor: Musty, nutty, vegetative, cocoa, brown, bready and caramellic |
| | flavor: Musty, nutty, cocoa, brown, vegetative and bready with a slight bitter nuance |
| FL/FR | | petitgrain lemon oil |
| | odor: fresh sweet oily floral citrus lemon tomato woody bitter |
| | flavor: citrus lemon lemongrass aldehydic tomato green citrus peel floral |
| Octonary (Eighth) - bitter |
| FR | | tangerine acetate |
| | odor: green citrus iodine tangerine seaweed waxy fresh bitter |