| Primary (First) - sour |
| FL/FR | sour | cherry essence |
| | odor: sour cherry |
| | flavor: sour cherry |
| FL | (E)-2,4- | dimethyl-2-pentenoic acid |
| | odor: sour cheese cream cheese |
| | flavor: cheesy creamy |
| FL/FR | | hexanoic acid |
| | odor: sour fatty sweat cheese |
| | flavor: cheesy fruity phenolic fatty goaty |
| FL | 3- | hydroxypyruvic acid |
| | odor: sour radish cabbage |
| FL/FR | 4- | methyl hexanoic acid |
| | odor: sour cheesy |
| FL/FR | 2- | methyl-2-pentenoic acid |
| | odor: dry acid sweaty strawberry woody fruity jam |
| | flavor: Sour, acidic, sweaty, berry- and fruit-like |
| FL/FR | 2- | methyl valeric acid |
| | odor: sour cheese |
| | flavor: buttery creamy slightly cheesy |
| FL/FR | | neryl isovalerate |
| | odor: Sour sweaty with floral rosy under notes, a bergamot citrus nuance and fruity notes of blueberry, cranberry, apple and grape |
| | flavor: Fruity, rich floral and slightly citrus-like with berry waxy nuances of blueberry fruity notes of apple, grape, peach and apricot |
| FL/FR | | phenoxyacetic acid |
| | odor: sour sweet |
| | | pyridine |
| | odor: sickening sour putrid fishy amine |
| FL | | pyruvic acid |
| | odor: sharp sour acetic caramellic |
| | flavor: caramellic brown sugar |
| FL/FR | iso | valeric acid |
| | odor: sour stinky feet sweaty cheese tropical |
| | flavor: Cheesey, dairy, creamy, fermented, sweet, waxy and berry |
| Secondary (Second) - sour |
| FL | | acetic acid |
| | flavor: pungent sour overripe fruit |
| FR | | clove bud concrete |
| | odor: oily sweet rich spicy sour fruity dry clove buds |
| FL/FR | | decanoic acid |
| | odor: unpleasant rancid sour fatty citrus |
| | flavor: soapy waxy fruity |
| FR | 1,4- | dipropyl-6,8-dioxabicyclo(3.2.1)octane |
| | odor: Latex, fruity, and sour |
| FL | (E)-2- | octenoic acid |
| | odor: musty sour fatty waxy dirty aldehydic vegetable cheese |
| | flavor: fatty terpy waxy green weedy wet hay |
| FR | | rhubarb fragrance |
| FL | | tamarindus indica extract |
| | odor: sweet sour fruity |
| | flavor: fruity jammy acidic dried fruit astringent sour |
| FL/FR | | valeric acid |
| | odor: Acidic and sharp, cheese-like, sour milky, tobacco, with fruity nuances |
| | flavor: Acidic, dairy-like with milky and cheese nuances |
| Tertiary (Third) - sour |
| FL/FR | iso | butyric acid |
| | odor: acidic sour cheese dairy buttery rancid |
| | flavor: acidic sour cheesy limburger cheese dairy creamy |
| FR | sour | cherry fragrance |
| CS | | diisopropyl adipate |
| | odor: mild estery fatty sour |
| FL/FR | | ethyl 3-mercaptobutyrate |
| | odor: sulfurous roasted sweet sour |
| FR | | kumquat fragrance |
| Quaternary (Fourth) - sour |
| FL/FR | | arnica montana flower extract |
| | odor: faint herbal spicy cocoa sour |
| FL | 2- | hexyl acetate |
| | odor: apple fruity pear sour |
| | (S)-4- | methyl-1-hexanol |
| | odor: spicy nutty green sour |
| | (R)-(-)-2- | octanol |
| | odor: creamy cucumber fatty sour |
| | (Z)-5- | octen-1-yl 3-methyl butyrate |
| | odor: fruit flesh melon ripe banana smooth sour woody |
| FL/FR | | phenyl acetic acid |
| | odor: sweet honey floral honeysuckle sour waxy civet |
| | flavor: Sweet, floral, chocolate, honey and tobacco |
| FL | | prunus spinosa extract |
| | odor: berry, plum, sweet, acidic and sour with a juicy nuance |
| | flavor: Berry, fruity, raspberry, blueberry and juicy with a tart and sour aftertaste |
| FL/FR | (±)- | tetrahydronootkatone |
| | odor: dusty woody fresh green sour spicy herbal fruity animal |
| Quinary (Fifth) - sour |
| FR | | cranberry fragrance |
| | 1- | ethyl-2-methyl propyl tiglate |
| | odor: fruity, woody, chemical, metallic, sour, and kerosene |
| FL | (E)-2- | pentenoic acid |
| | odor: acidic feta cheese buttery |
| | flavor: sour acetic buttery |
| FL | | propionic acid |
| | odor: pungent acidic cheesy vinegar |
| | flavor: Acidic, dairy with a pronounced fruity lift |
| FL/FR | iso | valeraldehyde propylene glycol acetal |
| | odor: sweet ethereal fruity tropical rummy sour ripe dairy buttery |
| | flavor: fruity ethereal tutti frutti tropical rummy ripe |
| FL/FR | | valerian rhizome absolute |
| | odor: balsam green sweet woody sour |
| | flavor: valerian root |
| Senary (Sixth) - sour |
| Septenary (Seventh) - sour |
| FL/FR | 1- | ethoxyethyl acetate |
| | odor: fresh green estery fruity aromatic melon rind bell pepper sour acetic citrus |
| | flavor: estery ethereal fruity green tropical winey melon rind passion fruit |
| FL/FR | 4- | methyl nonanoic acid |
| | odor: meaty pork lamb chicken |
| | flavor: fatty goaty |
| Octonary (Eighth) - sour |