Aroma Description:
chocolate, cocoa, coffee, hazelnut, musty, nutty, vegetable1

Receptor log10 EC50 Adj. Top Antagonist? Hypothesized PQ Associated Perceptual Qualities (PQs)
OR5K1 -9 2 -  pyrazinic3
hazelnut, nutty, roasted, peanut

1.) The Good Scents Company

2.) Mainland JD, Li YR, Zhou T, Liu WL, Matsunami H. Human olfactory receptor responses to odorants. Sci Data. 2015 Feb 3;2:150002. doi: 10.1038/sdata.2015.2. PMID: 25977809; PMCID: PMC4412152.

3.) Marcinek, Patrick, et al. "An evolutionary conserved olfactory receptor for foodborne and semiochemical alkylpyrazines." The FASEB Journal 35.6 (2021): e21638.

References for aroma perceptual qualities should not be taken to indicate that the authors of outside studies necessarily assigned aroma notes to the neurons that receive input from any given receptor. Rather, the findings of outside studies often constitute the information on which we base our own perceptual quality assignments.