| Primary (First) - sour |
| FL | | acetic acid |
| | flavor: pungent sour overripe fruit |
| FL | sour | apple flavor |
| FD | laevo- | arginine |
| | flavor: sour |
| FL/FR | sour | cherry essence |
| | odor: sour cherry |
| | flavor: sour cherry |
| FL | sour | cherry flavor |
| FL | sour | cherry juice concentrate |
| | flavor: sour cherry |
| FL | 2,4- | dimethyl-2-pentenoic acid |
| | odor: acidic fruity cheese honey |
| | flavor: Tangy, acidic and cheesy with ripe, fruity and animal nuances |
| FL | sour | dough flavor |
| FL | 3- | hydroxy-5-methyl-2-hexanone |
| | flavor: sour cheesy milky |
| FL/FR | | lactic acid |
| | flavor: sour acid |
| FL | laevo- | lactic acid |
| | flavor: sour acidic |
| FL | calamansi | lime fruit |
| | flavor: sour lime |
| FL/FR | 2- | methyl-2-pentenoic acid |
| | odor: dry acid sweaty strawberry woody fruity jam |
| | flavor: Sour, acidic, sweaty, berry- and fruit-like |
| FL | 3- | methyl valeric acid |
| | odor: Animalic, sharp acidic cheesey, green with a fruity sweaty nuance |
| | flavor: Sour, cheesey, fresh with fruity notes |
| FL | | myrica rubra fruit juice |
| | flavor: sweet sour similar to cranberry or pomegranate |
| CS | | myrica rubra leaf/stem extract |
| | flavor: sweet sour similar to cranberry or pomegranate |
| FL | (E)-2- | pentenoic acid |
| | odor: acidic feta cheese buttery |
| | flavor: sour acetic buttery |
| FL | | soursop distillates |
| | flavor: tropical sour fruity |
| FL | | succinic acid |
| | flavor: sour acidic |
| FL | | whiskey sour flavor |
| Secondary (Second) - sour |
| FL | sour | blueberry flavor |
| FL/FR | | butyric acid |
| | odor: sharp acetic cheese butter fruit |
| | flavor: Acidic sour, cheesy, dairy, creamy with a fruity nuance |
| FL/FR | iso | butyric acid |
| | odor: acidic sour cheese dairy buttery rancid |
| | flavor: acidic sour cheesy limburger cheese dairy creamy |
| FL | sour | cream flavor |
| FL | sour | grape flavor |
| FL | sour | lemon flavor |
| FL | sour | lime flavor |
| FL | sour | mango flavor |
| FL | sour | pineapple flavor |
| FL | sour | raspberry flavor |
| FL | wild | raspberry flavor |
| FL | sour | strawberry flavor |
| FL | | sweet & sour candy flavor |
| FL | | sweet & sour flavor |
| FL | | tamarind flavor |
| FL | | vinegar |
| | flavor: sour vinegar |
| FL | balsamic | vinegar flavor |
| FL | sour | watermelon flavor |
| Tertiary (Third) - sour |
| | | ethyl 2-thenoate |
| | flavor: fermented grape, sour, winey |
| FL | | yogurt flavor |
| Quaternary (Fourth) - sour |
| Quinary (Fifth) - sour |
| | 2- | ethyl thiopyridine |
| | flavor: green, acid, cereal, bitter, sour |
| Senary (Sixth) - sour |
| Septenary (Seventh) - sour |
| 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 |
| Octonary (Eighth) - sour |